1) What do your players want? Do they want to play in a gritty, realistic version of GFFA where they have to fight uphill and really should avoid any fights at all (like Andor) or do they want to play cinematic heroes of their own trilogy, with the same likelihood of success like Luke, Leia, or Han (or Rey, Finn, or Poe, or Anakin, Padme, or Obi-Wan)? I generally pitch and run the latter. Plenty of GMs prefer the former and have done so since the game came out.
These things are not incompatible. I run a gritty realistic version of the Star Wars universe where in that same universe there are cinematic heroes of great martial prowess. That's a matter in D&D terms of relative level. If you are a 6th level D&D character and you mostly encounter 1HD orcs, you're going to feel like a big darn cinematic hero. But if you are a 1st level D&D character and you mostly encounter 1HD orcs, you are going to feel like you are in a gritty world where all fights are dangerous and uphill and fights are worth avoiding as much as possible.
I don't have to choose here.
In the game, after 90 sessions or so, the PC hunters are pretty famous feared bounty hunters who are more than capable of holding their own with or absolutely destroying most opponents. Veteran Stormtroopers aren't pushovers, but they certainly outmatch them. At this point, they outmatch 1v1 most Stormtrooper special forces and covert ops units. Not again that they mostly fight stormtroopers, but for example several recent fights have been against the equivalent of veteran Stormtrooper "jump troopers" with jetpacks and gunship support (the fight against the corrupt SWAT team on Aparo prime, against The Aguila's resistance fighters on Lafra, etc.).
But yes, they are at the point now that a fight between them and say a dozen Commando Battle Droids is pretty one sided in their favor, the way it wouldn't be if regular Stormtroopers and Commando Battle Droids went at it.
[*]Pretty Armour Does Nothing (no bonus to soak from the armour)
That's just "dumb" in my opinion. If it does nothing, they wouldn't wear it. The Empire is pretty heavily on the side of penny pinching and if armor wasn't worthwhile, they wouldn't pay for it.
[*]Stats are Pretty Average, Actually (2D across the board)
[*]Basic Training is Basic (skills +1D at most)
That's Imperial Trooper level foes, not Stormtrooper level foes. I do have those, and they show up a lot, because unlike the movies I don't have to pay less for an extra if their face is hidden and doesn't need makeup or other work, and unlike video games I have no extra cost up front to render faces onto models. So I have no non-universe reason to make all the foes Stormtroopers to save costs. I can have viable Imperial Troopers that are still a level of dangerousness above that of ordinary people, while reserving room above that for a smaller more elite force directly under Palpatine's control.
Basically, Stormtroopers are 1 level above what you suggest. Physical stats tend to be in the 3D range, and combat skills tend to be +2D above that. That makes them comparable to all but a combat optimized starting PC, and means that they can do both 3D in blaster and reserve 3D for dodge when they want to (though they prefer taking cover to dodging) while still wearing armor and getting 4D soak against blasters. An Elite Stormtrooper (say an aging veteran Clone Trooper) or a typical Covert ops type Stormtrooper (say working with the Inquisitorius or the ISB) are about 2 pips above that that, so like 3D+1 Dex and 3D+2 Strength with blaster and dodge in the 5D+1 to 6D range, making them formidable foes (often with armor and weapons self-customized by a pip). Are you telling me based on the Clone Wars/Bad Batch cartoons that if you were to find a named Clone Trooper still in Imperial service a few years after the end of the Clone Wars that would strike you as unreasonable?
But against the bounty hunters, that might not be enough. I've got PCs with 7D in dodge and blaster, with customized gear that's like two pips better, so like a blaster rifle that does 5D+2 with a customized smart scope that adds 2D+2 to blaster if they take an aim action, and by my house rules you could take a called shot to drop 4 dice off blaster roll that to go to 7D+2 damage. I don't have a problem making these characters look like the cinematic action heroes in their own TV series or movies. I gradually getting up to the point where I need BBEG's with 9D and 10D and force points to spend in order to give the collective party a challenge.
[*]One Hit and I'm Out (any damage that exceeds soak takes one out; it makes for easy bookkeeping)
Same rules for everyone. I tend to not track unconscious mooks because it generally doesn't matter if they are dead or wake up in 30 minutes barely able to function, they are out of the scene, but foes get wounded and try to flee or keep fighting depending on the foe and the circumstances.
With the above modifications, and with the players wielding weapons doing 4D-5D damage, stormtroopers go down every time a PC hits one. A bunch of mooks with 3D in Blasters are still a threat, however, because it's possible that one of them will hit and 5D damage from a blaster rifle is no joke, so PCs will generally run from dozens of stormtroopers.
Absolutely not. 3D in Blasters when you are wearing medium armor that gives you a -1D penalty on Dexterity rolls results in a situation where you need hundreds or thousands of foes to be a realistic threat against these characters, and isn't even really a realistic threat against starting characters. 4D in blasters in my game is a civilian weapon hardly worth bringing to a firefight against a real military. The standard issue Imperial carbine does 4D+2 in my game. I have a PC with 5D strength and 1D+1 LIGHT armor who also has a 6D dodge. I've got another PCs with 3D+1 strength who is gearing up for powered battle armor who is probably going to be sporting something like 3D+1/2D+1 armor soon. And he really really wants to get some Beskar Steel. I've got a PC with 7D dodge and 7D sneak and like 7D in melee with a customized vibrosword, and he has stealthed urban camouflage clone trooper armor that means he's often rolling more than 7D to hide or creep up on someone.
And if I hadn't been planning for this by allowing for more of a power curve, then we'd long ago left the realm of plausible foes for them. As it is, we aren't even halfway to the level of someone that can seriously challenge Boba Fett, Han Solo, Chewbacca, or Luke Skywalker although collectively they might represent a non-trivial challenge to such characters.