Crappie are predators too. There is some conficting info out there but basically white crappies are never recommended for a pond your size. Black crappie maybe but probably not. Do a search on crappie and you'll probably get a ton of info, mostly saying not to stock them. If your looking for good growth of the predators in your pond then the experts will probably recommend removing about half of them and stocking more BG of adequate size to escape predation, which would be easier sooner than later. It seems that once the predators are reduced and forage increased you may be OK for YP, again sooner than later because your predators are going to keep getting bigger. Hopefully one of the experts will chime in.