The b2 landing in Clone is really the only deterrent I could find. You mentioned you feel similar plus frames... that should mean you're going for the longer delay after f1,2, right? I mean, if you did the slight delay, you shouldn't feel the same plus frames. It should feel like a whole lot more. So did you mention that combo after landing in Clone as a confirm just in case the opponent happens to land in it? (if not, disregard the following...)
I ask because if you time it properly and assume they won't land in Clone, then the combo after b2 would be 242~1~b1,2,Clone~NJP~JIP~f1,2. With how fast you have to time 2,4,2 to catch the peak of b2's bounce, it seems difficult to me to land a b2, confirm that they landed in Clone, and then alter your combo as you mentioned. I experienced landing b2, then quickly inputting 2,4,2, and having the opponent contact the Clone right before 2,4,2 connected thus fucking up the gravity/combo.
However, if you do the slight delay, you KNOW they're gonna land in the Clone, so you can just not input 2,4,2. Or do I just need practice?