Maybe your lake is mostly too shallow for good crappie recruitment?
There is lots of discussion about crappie preferring "open water" during portions of their life cycle. I always think of that as the deep water away from shoreline cover.
I have never considered the actual water depth as a critical variable.
Have you read up on the threads where people have good crappie production in their ponds? What was their maximum depth? What was the depth of most of the pond basin?
(I don't know the answers, but I certainly don't remember that variable being discussed in the crappie threads I read in the past. Don't know if that is the fault of my memory, or if it was not discussed much?)
Rod I have read everything in forum about BCP and have come to the conclusion that there is less known about them than is known….. think there are many variables that happen to make or break them. Haven’t seen any ponds around here that they took over and stunted, not saying that they can’t but in 5 ponds up to 10 acres have not even come close to stunting or having a abundance of BCP gives one doubts about that being a problem. Most of the ponds close by are shallow 6-8’ when full…and all have 10# bass that have been caught recently….. your guess is as good as mine. Wish it was a little more definitive but it hasn’t been