What I'm afraid of is a large number of GSHD out growing the gape of the crappie,LMB, HSB. Would electro shocking the BOW every two years be the only way to remove Large shad ?
Is there a reason you are set on stocking shad? I think of them as forage used in very large BOWs. I would think E-shocking every couple years would get expensive. You say you have FHM already. I am not a pro for sure. FWIW IMHO if your true desire is big crappie, I would pick another minnow species to supplement the FHM like SFS that will stay closer to the mouth gap size of a big crappie.