Technically, he's right about true grit. It states that you get +1 A for having 2ccw, EXCEPT on the turn you charge. However, on the turn you charge, you get the charge bonus, so it works out the same.
Psycannons aren't worth it. 50pts for a couple Str6 shots, that you'll only use once, maybe twice, then be in assault the rest of the game? And you loose Str 6 and True Grit in the process? Yeah, I'll stick with two basic GK's instead.
That's not to say that psycannons are never worth it. But I used to play psycannons, and now use Incinerators. I've done both, and found that Incinerators work way better, in pretty much every case.