Can't speak as to the qev repair, but most people recommend that IF you choose to use qev's on a mech you should only use one. Qev's are not of much use on a mech, they make them hard to time and do not provide any benefit, you can't shoot it fast enough for a qev to help in any way. You have one of the smoothest rams ever made, I would personally take them off, or just use one on the front. It will shoot a lot smoother.
Autocockers are not more accurate, I'm just more accurate when I shoot autocockers.