I matched with Bullet and Homing a lot (over 200 matches); so I know how they used to play.
Bullet tends to line either above or near the person, and the person generally tends to run into his line. It is not usually a direct hit, as in he usually never aimed at the guy, he usually aimed near the guy. This being said, it's pretty easy to dodge his lines once you know what he does and where he aims.
Having watched Bix's demo, the first minute or so on Blitz was normal, but after that... it gets fishy. The constant twitching, and bullet actually aiming on his target is unusual for him. Not to mention his split-second reaction speed... I've never seen that from him.
They were clean when they were in UnderRated. Our entire clan was. But since VA started, I can no longer say who is using what. I'm making no accusations, however, that is not the same Bullet I used to match with.