@AlfalphaCat
Good point, I never factored in weight class. You're right.
Hit and run mechs would favour PPC/Gauss.
Stand and fight mechs would benefit from big ACs.
For me, I mostly roll in the Scat A, so I:
a) stand-and-fight against mechs lighter than me,
b) hit and run (burst up to 5 UAC20 shots, then do some fancy dancing) against mechs heavier than me,
and
c) "snipe" from 400-500m against groups of enemies larger than my group (situational)
Note: In the next patch, heat mechanics may be tweaked a bit to bring balance to ERLL and ERPPCs next patch (points at Novaboat), I hear.