I would stock hooks, and lots of them.
IMHO, this is the single most important remedial step, and short of killing the pond, just about everything else you do will be thwarted if you don't start with this.
However, stocking even a moderate number of really large, healthy adult BG, then feeding, will have definite impact as well, even if you use only one feeder. You don't have to use expensive food to assist the BG, and, don't worry, they'll rapidly get the hang of eating pellets. Added bonus-your son will get a kick out of watching the fish feed, too.
