Crappies will attack a big bait at times. Just look at the ones caught on crankbaits. One of the best SLAB CRAPPIE days I ever had was on bass sized chubs. That was in Pymatuning lake on the Ohio/Pa border.

If ever we should have took a picture that would have been the one. We were using size 1 and 2 abeerdeens that day. Had to use larger bobbers to keep chubs from pulling them under. None of the crappie we caught that day was under 13 or over 15. Don't recall how many but there where a pile of them.