OP, could you rephrase your entire post? I'm having a lot of trouble trying to understand it.

Commandos have the opportunity to deal 17% more damage than usual, at the very least (1 high).

Assaults have the opportunity to deal roughly 13% more damage with stacking penalties applied with 3 highs and all light damage mods.

So, little difference, but a huge difference in stamina, speed, and regen capabilities. Also, health, I guess.

Three damage mods:
1.00 +ù 1.07 +ù (1.00 + 0.07*0.869) +ù (1.00 + 0.07*0.571) = 1.180

Commando + one damage mod
1.00 +ù 1.10 +ù 1.077 = 1.177

Three damage mods barely edges out a single high slot commando.

Anyone who says a Caldari commando is useless has no idea what they are talking about. I straight up own people in a calmando; both in pubs and PC. Run triple damage mods with an arr or regular rr and have fun annihilating anyone who gets in your way. Pair it with a swarm launcher or tactical sniper rifle and beast away. At prof 5 for the rr/sr, with 5% damage from warbarge, ~18% from the damage mods, and 10% from the suit itself, you are putting out x1.48 damage to armor.

Actually the Gallente is in a pretty solid place as well. I think the main issue the Amarr lack is that the two light Laser weapons available don't provide as much utility like the others have. It is and it isn't in my view its like yes the Galmando is powerful but the damage doesn't match that of the Gal assault. Im a strong believer of mandos being able to chose to become glass cannons? Sacrificing armour and shield for alpha damage? Sentinel modules would mean a minmando would become a more powerful av which when you look at armour hardeners? Worth it. Calmando could add a recharger or more shield. The Gal could add a dmg mod and the amar gains more survivablitly, because let's be honest the damage on that lazer and Scrambler haha

I mean sure, you can get more damage out of a Caldari and Minmatar commando, but they're sacrificing their main tanking slots to do so, which is a hefty tradeoff for the damage output.

I think if we got the Amarr another weapon they could use to up the utility, and gave all Commandos the same slot layout as the Sentinel, we would see things fall into a pretty good place, Amarr Commando included.