I don't think there's a reason to. You can easily get poked out of 3 and 33 even if you release the RH with no delay. 3 is his best move for punishing certain things though, like reptile's dash.
Yeah dude when you get negative edge your trying to do it too fast. Pace yourself and your RHC will gradually get faster. BTW 4 xx RHC and 4,3 xx RHC are better IMO.