It sounds like switching to Saga would just bring a new set of problems to solve.
Based on canon, the best ships in the game should be gunships that have been modified to have star fighter like speed and agility - think Millenium Falcon, Ghost, Luthen's Haulcraft, Moldy Crow, etc. The Falcon for example combines the best qualities of a star fighter with enough shields and hull to not die the first time they are hit by capital ship scale weaponry and has the subtle advantage of having multiple crew that can each focus on single tasks. The second-best ships should be the extreme high end space superiority craft where unlimited skill at piloting gives you effectively unlimited ability to avoid getting hit while still having enough firepower to harass or destroy even the modified gunships. These are the hero ships, though arguably at some scale heroes seem to also use the Star Destroyer scale ships as well.
I love the Tie-In, but it shouldn't even be possible to put shields and proton torp launchers on it. There isn't enough space, and if you increased it's weight to give it enough space, it should be relatively ungainly like a Tie-Sa. The Tie-A has the extra hull space for that sort of thing and Tie-D's and Tie-A's should represent the peak of what you can do with that hull.
Ughh.
I have a modifications to the Capital ship damage rules that I intend to put in place that should balance large capital ships against smaller ones better. Basically, bigger ships should have bigger damage tracks. That may require some rebalancing on the super-capitals to drop their hull closer to capitals in exchange for truly massive damage tracks, but I don't really intend to run engagements with super-capitals ever anyway and besides which the stats for capital ships are all messed up across the board anyway simply because you can tell people threw them out and never play tested them.