Zardnaar
Legend
I think what you've got for power armour works, probably plate armour and then the better ones might have a "+1" to AC. Shock absorbers reducing falling damage. I'd think reducing falling damage would be better than feather fall, even though they do negate it completely in the game.
Power Armour Frame
Strength set to 19 minimum, double carrying capacity.
Shock Absorbers.
I'd maybe set up the AC of the various power armours as below.
Raider. AC 16
T-49. AC 17
T-51. AC 18
T-60. AC 19
X-01. AC 20
Then you can start getting into the various upgrades in the game. upgrades that boost strength, grant a fly speed, shoot a tesla coil, provide radiation protection, etc.
This is roughly what I'm thinking.
I won't be using the FO4 labels but will probably base it off animals/predators.
Lion/Tiger/Bear/Dragon something like that.