My LMB have started to take the larger pellets now. And the HSB are taking them aggressively. In fact, the HSB seem to prefer them over the Aquamax 600 that I have began to feed again.
My LMB were NOT pellet trained when younger. They seemed to 'self-train'. I don't know if they learned it from the SMB they live with, or just learned it out of neccessity. I rarely see a LMB over 2.5 lbs feed on them, but they do feed on them.
I haven't rod and reeled a HSB since I started feeding this to them, but by watching them feed they seem to be growing quickly right now. In the next few weeks I will be fishing the pond more and I will report the body conditions back here.