Billshut, with the exception of the amarrlogi, lack of a sidearm slot frees up that CPU/PG

If this is about stacking damage mods.
Simple solution, remove logi suits ability to place a damage mod on the suit. Thus removing the whole uber damage mod stacked logislayers.

I personally place precision enhancers or shield extenders on my logi suits, and now that shield extenders have a drawback with the recharge delay its a little more balanced.

With this setup, the assault suits can stack damage mods at the expense of EHP tank, since they now have logies that cant stack damage mods to out perform them as assaults. Logies now have the support role to keep the assaults alive and stocked with ammo, while still helping with the fight with their primary weapons without damage mods. Assaults are faster than logies, so the logies still need the tank to stay alive in the fight because they cant get to cover as easily/quickly

Logies get the tank, assaults get the pure dps and in a 1 on 1 assault vs logi of comparable equipment it now becomes more balanced and more about skill.