GRUBB, this is a minority opinion so take it for that. The crappie can be managed very easily. Bob Lusk wrote an extremely good comment about managing green sunfish. Use the same approach to managing crappie. Essentially, you establish a good bluegill population. And then you add LMB that are too big to be eaten by the crappie. The secret is to over populate the predators. Since the crappie only reproduce once a year, the population shifts to bluegill as they spawn more often. You can NOT depend on natural reproduction of LMB. The crappie reproduce before the LMB and then eat the young LMB. You will have to keep adding LMB large enough to not be eaten (8-10").

The wild card in all of this is your existing fish population. Those large catfish and LMB eat everything. You must not have many of them though or they would have eaten those 5" crappie.
You might have to remove them to protect your newly stocked LMB.

Adding another predator is always a good idea. Wipers might be a good choice. You will have to depend on annual stocking. You would do this with LMB as well. Also consider adding redear sunfish.

Norm Kopecky