Ok.
Good research done OP. You have a clear understanding of the numbers involved.

Being fully skilled into Gallente suits, I have a clear understanding of those numbers in action on the field, so I'll weigh in a little bit.

Gallente Suit playstyle:
- Gallente Logi suits are VERY slow. Because of that inability to change engagement distance at will, they are best played at mid-range, and watching allied flanks. I usually go with 2 reps and 3 armor plates. Anything else in my lows feels like a waste.

- Gallente Assault suits are much faster than the Logi counterparts. You can flank, rush, and engage from any distance, and make quick escapes if needed. Paying attention and using the environment CAN make up for the native armor rep not being there. When you attack, as Gallente, GO FOR THE KILL, and do not make the firefight drag on, because your armor is not designed for that. You have a higher chance of winning the brawl itself because utility weapons are weaker vs. armor, but if you let the fight drag on, by doing little strafe fights here and there, it won't work out for you.

Gallente vs. Caldari
- I agree that the Gallente assault bonus of reduction to hybrid weapon cpu use is of little benefit.... the BIGGEST reason being because the Gallente suits are the absolute best when combined with laser weaponry, NOT hybrid.
A spec'd Gallente Assault/Logi suit with a spec'd Scrambler Rifle or Assault Scrambler Rifle WILL WITHOUT FAIL out-dps and kill a Caldari suit using an AR. The numbers are on your side, and if you have sufficient skill, you WILL win EVERY time.
AR is weakened vs. armor. even with proficiency, most Caldari suit users don't like to utilize damage mods, preffering to rely on their shield tank.
SCR is powerful vs. shields. add proficiency and damage mods to this equation, since you do not require shield defense, and you will chew through 400-500+ shield HP, in nearly a 1/6 to 1/4 the time it'll take for that Caldari to chew through your armor.
The key is to close the gap on that caldari player fast. Catch him and he's dead, but you can't afford to let the fight drag on.
The armor bonus coming 1.4 is only going to further guarantee the outcome.

TL;DR
Gallente suits w/ scrambler rifles and assault scrambler rifles have the advantage vs. Caldari suits w/ assault rifles. The Gallente weakness comes in, because it's grossly weak vs. everything else. A different passive skill bonus for the Gal assault suit would make the difference.