Make guesses together with someone and compare yours.

I'd try decreasing armor class to 150 and then see how it turns out, 90 AC indeed was hardly usable for close quarter combat characters, but this number is just my guess (70 less AC seems like an appropriate dose of balancing) + lower chance for jinxed to occur at least 30% less,
lost drop weapon, lost turn, critically missed happens very often in general.
...
I haven't seen any armor class powerbuild big gunners now with all 220 cap. Only some low health point bluesuits with miniguns witch aren't very practical. Take notice that kamikaze decreases damage resistances appropriately now and big gunner isn't able to use perks witch are meant to increase armor class for unarmed witch ultimately decreases the total and have to wear armor to be effective witch is more reduction of armor class.
I'd actually like to see some hybrid kamikaze sniper builds witch counters other sniper lines of just soaking up some of the first shots as misses, it's cool in my opinion.

Players that use gear never were the problem remember.