Source hand throw LMB pellets, HSB prefer them, will soon get trained to look for them primarily provided their gape is sufficient. Optimal LMB pellets are smaller than AM - that's what I'd try. Once your HSB are used to taking the larger pellet it's very simple process to collect them anytime you're feeding with pellet fly or pantyhose wrapped pellet. If they exist in your fishery, you're guaranteed to get a strike - just set and reel it in. I advise laying off HSB angling once water temps hit 80s as they can fight themselves to exhaustion/death. I shut down all fishing from late June until September as I've lost too many trophy SMB and HSB even with a quick fight and clean release. Just not worth the risk for me.
Many men go fishing all of their lives without knowing that it is not fish they are after. ~ Henry David Thoreau