Harvest every crappie that you catch.
Harvest 10lbs+/per acre of the smaller bass and your RW should get better on your big bass if you have all your forage in balance.

Harvesting fish is the best tool you have. Lot's of info. on this board, plus some past "Pond Boss" articles were very good. If you haven't bought the book "Raising Trophy Bass" then you should. It will give you lot's of advice on this subject.
Good luck and enjoy the fishing.