If you introduce another forage species for LMB, 2 things "may" happen.. pressure will be relieved on crappie to the extent their growth rates suffer because numbers will increase-size will not and if you continue to cull LMB at that 12" range, the BG are going to explode and take a lot of your carrying capacity away.
I see 2 choices.. 1 is maintaining a large panfish situation which would be the Crappie and BG, or 2, cull as many LMB from 8-14" as is possible and grow larger bass.
Crappie can be a formidable predator themselves but the balance of LMB and Crappie can be difficult.
