ML :
A couple of thoughts. There is a reason almost all the state fisheries scientists/extension services say do not use crappie in small (under 80 acres) ponds and you have just posted (ided) the reason , giant swings in reproduction. Some studies suggest that crappie (like gizzard shad) can sense the population dynamics of the water and somehow stop or hold down reproduction in the entire pond. The more I read the more I think many fish may sense population dynamics and adjust reproduction strategies for a host of reasons.
I know of no way to have a good crappie pond that does not involve a lot of work. But there may be one. I don't think all the options are in yet and the time for making a final choice is not here yet. The pond will be built the same no matter your final choice. All you have to decide now is building the pond questions and that should be the same -- leave some bottom features like humps and ridges and stumps etc. leave some spawning places (gravel if there use it) - deep water near humps/spawning areas , islands -- all the stuff you already know. Use that scientific method -- gather all the facts -- test in your mind the outcomes - then draw a conclusion. No need to rush the choice yet. You know the drill well . I say stick to the process that has worked well - make the choice at the right time and you will know when you are there.