I wouldn't disagree with seeing a buff to the AC's dps vs infantry with it's normal gun (not upgrade) so you can at least run down snipers properly with it. But I would really not like to see it turn into the unit that it used to be in vcoh because it was way too good vs infantry, I like it's specialized role now.
Yep, I'd have to say that's the only change that might be necessary, but it certainly worth testing via patch.
I've noticed that by the time I can get the 221 AC on the field, I can usually afford 2-3 of them. I'm pretty far away from getting PIV's/StuG's, and don't tend to have the infantry stopping power necessary to deal with 3 conscripts + maybe a guard squad.
So I get two ACs and head to micro-city. I find that they are the bane of Combat Engineers and Conscript squads. Well micro'd, they can take down half a squad before the heat-seeking AT nade flies through the fog of war. Having a fallback point where pios and vehicles can congregate is fairly essential, but the AC's are so cheap relative to other vehicles that eventually become available that losing about 2, or even 3 of them, won't hurt your forces as long as you aren't completely relying on them.