I will dig around and see what I find.

I do have a suggestion. Get Dwight's underwater camera (it should have IR) and look for the big crappie around structure at twilight/first dark. Another option which I don't suggest often is catch a big one just before dark and attach through the dorsal fin a 30-40 ft piece of very small line 2 lb test with a very small bright float/cork/bobber on the other end. The line must be long enough so that the float never stresses the fish by being pulled under. Wait and follow the float. Gently take up slack to see the exact spot and mark it. Then harvest the fish or take out the line and release - your choice.