how many HSB were initially stocked? If I recall right I believe HSB at least up to 5lbs prefer to only eat BG up to 3" because of the BG body shape but I would think if the were hungry enough they try tp eat bigger BG. It may be harder to establish a good population but you could try diversifying the food chain with golden shiners or threadfins if you can find them. Just keep feeding the HSB to possibly give the baitfish a chance to grow and spawn. If that doesn't seem desireable and you don't think the HSB are eating the BLG as desired you could just go with it. View the HSB as a put and take fishery, load up with 12"LMBs and also grow larger BGs.