Actually, it would be great to hear from our resident experts now that I think about this more... There's a chance that if you shift the HBG/YP balance from what is now HBG heavy and YP light to the other way around, having fewer HBG and getting more YP recruitment, those YP YoY would be more of a target for your predators which means they would probably eat fewer HBG YoY.

One way around this issue would be to isolate YoY YP in a cage or behind a blocking net to protect them from predation (also brings advantage of easier pellet training), whether that be via trapping YoY YP after they hatch or moving egg ribbons before they hatch. I think in this case, your SMB and HSB would be forced to eat more HBG YoY than if you left all your YP YoY to fend for themselves out among the sharks.