6FRC6 should work, it'll take a bit to get used to buffering the first 6 at the right time, but it works.
For the VT loops, if you're doing the exact combo then it's just the matter of the way you time the Javelin (since you can delay it) and knowing the landing recovery on VT so you know when to catch them with a normal. They also don't work in the corner unless you F/RC the javelin, so make sure to do them midscreen.