FWIW, my feeling is that the Plasma Cannon is borderline too good, even considering the OP cost. The flux consumption is high, but it absolutely wrecks anything it hits. Doesn't even compare with the Autopulse - which is decent enough now, but not in the same league damage-wise. Having more OP to play around with due to skills is only going to make the PC better.
Edit: although, this is based on using it prior to the bug fix with the flux damage multiplier. I'll take another look and see how it feels.
Edit #2: An Apogee with one still mauls a pair of Enforcers, even with a terrible loadout otherwise and with me playing extremely badly. Doesn't feel that much different than before.