is there any vegetation or cover for yoy fish in this pond? The photos make the pond look almost barren of weeds. That's tough if your goal is a balanced population. As you have discovered, adding forage (FHM) is temporary and expensive. I think you need to begin removing those plentiful size class of LMB. Adding adult BG might help if there is some cover for YOY fish.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.