I slept at a holiday inn last night so I know enough to offer this advice:

1. Get rid of the crappie. How do you know that you only have ten crappie in a 3+ acre pond? They will compete with bass for food, and will spawn earlier and can decimate fingerling bass. 2 crappie are too many crappie.

2. Sounds like you may have several species that are not desirable in a small pond (carp/crappie/bullhead) these can be difficult to get rid of in any pond without starting over if that is your goal.