Only thing I have ever landed after a 3,4 is a slide. I always though the opponent was to far away and not popped up enough to be able to dash in and get anything else in there.
Unless in a corner of course... then it's 3,4,3,4,3,4 slide, but someone above said you can do a 3,4,3,4,3,3,3, slide... gonna try that in the lab....
PS. First time posting here, know some of your screen names from xbl. I play mainly CSZ with a bit of Freddy thrown in.