I actually think you and halfway there with bonuses..

Recommendation:
1) Amarr heat reduction bonus stays
2) Minmatar ammo increase for sidearms is upgraded to allow it to work for the combat rifle and HMG
3) Gallente keeps the hybrid weapon resource reduction perk
4) Caldari should get a decrease in spool time for rail weapons or another weapon related perk.

The entire bonus system needs to be redone. A blanket bonus and a semi-useful racial is wishful thinking but I'd rather see suits have 1~2 flat bonuses that you get for using/unlocking the suit and another pair of bonuses that are fitting to the racial suit's style of combat. Nothing that's 100% racial weapon related, but something that's open ended enough to a player's interpretation to mix and match their fittings. Making everything racial based would be way too restricting, even from a lore standpoint since we're mercenaries to begin with. A good example of what I'm getting at is the Gallente assault/logi and Minmatar assault. The Gallente gets to stuff as much gear into their fittings, even able to use better meta level stuff on lower tier suits. The Minmatar plays into the hit-and-run style by making close ranged weapons (sidearms aren't just for finishing people off) more potent than they already are by using their speed advantage. Both races do so without limiting them to their specific racial weapons/gear. I don't know where this x race needs to use y weapon mentality came from, but even EVE players mix and match racial technology in their fittings. Dust should take it a step further.

As far as the assault suit goes, it's nothing but a slightly cheaper basic suit with two bonuses and a paint job. It's an improvement over the former, just not worth the SP investment. This is why we've had so many assault vs logi threads in the past. The assault suits aren't worse than their logi counterpart at all, just not as attractive. Logis trade base stats and a sidearm for more equipment and an extra module slot. Assaults should be the opposite with better base stats to make them less HP module reliant. More base shields and recharge rate for Caldari and Minmatar, base armor for Gallente and a little of both for Amarr would make a world of difference allowing these suits to focus a little less on extenders and plates and more on weapon mods, rechargers/regulators, armor repair, and other modules. Of course this would have to come with a tradeoff to keep the basic frame from being nothing more than a stepping stone, but you get the idea.