My personal opinion on plasma guns is that I think they are in a reasonably decent position right now and if I were to change anything bring PG dmg up to the fellwroughts dmg while bumping fells by 5 and increased heat generation. Then say give 10 points of increased penetration. That way they are a bit closer to TT while having resemblance of balance in game. As for PC I don't use it and don't see many but I think they are fine now as to before
I agree with the buff, but i would make this weapon mid to long range weapon to make it unique in some field. Around 3-4 headshots to kill would be fine with me - damage-wise.
You want a buff for plasma? Sure, here ya go 70 LP +2 dmg increase but the aoe will be 15% smaller and heat build-up 15% faster. Not good enough for ya? Ok, let's put plasma weapons rank 6 only (because nodoby cares how hard it is to get one in the first place and how religiously they are guarded by the Adeptus Mechanicus) Oh? Started to roll eyes? Fine, now they are rank 6 and 20k RTC. Point: be gratefull with what the devs gave you because other factions beside CSM don't hold so much favor as the "Emperor's chosen"....which you are not irl, same with me and the others.
So you lob potshots of PC blasts into entrenched areas from angles where your targets don't see it coming... And that's an argument for it being OP? Hell, Lascannon is the best weapon in the game, then. Even if it is useless vs vehicles because despite being one of the best AV weapons aside from Lances (and yes I would want to see Eldar tanks get a buff because their lances are pathetic), it's poorly represented thanks to some asinine vehicle damage mitigation via toughness rather than just punching holes in tanks like it's supposed to.