Another thing you can try for HSB:
Get a TH feeder, adjust the spinner plate to its lowest position [this is really easy to do on a TH feeder], and feed Skretting 1cm pellets. Not as big as AM largemouth but still a lot bigger than AM 600; the feeder is proven, readily available, and Skretting makes great feed that they'll ship to you. Ain't cheap but won't cost a heck of a lot more than AM largemouth, you'll spend less on the feeder, and you'll have fantastic growth.
