I went back and re-read this entire thread. The OP started this as small bass-large crappie, how does that happen.. You need to read that again. Lots of small bass will leave fewer crappie that given the best conditions, grow big. Key is having large numbers of small bass.
If bass are culled and BG are added, I see one potential outcome... a few medium bass, a few small bass and loads of small crappie and BG. I'd leave it alone unless the opposite of what you have now is what you want.
