Consider that in LMB crowded ponds there are usually a few fish that jump the log jam in size and keep growing on BG and small LMB. One or two in a 1.5 acre pond will sooner or later get big. They will eat ducklings.
I vote for HSB and a few CC and feed them. Take out via fishing ,seining or traps lots of small BG and a few CC and HSB before they get to big.