CC alone would likely not control HBG reproduction. I believe HSB would be an excellent addition to the pond. Stocking 10-15 per year would add an additional bonus fish that would also help control HBG reproduction. I would work at limiting aquatic vegetation and keep cover to a minimum to help your predators feed on the HBG offspring. I would avoid LMB if possible. They can become a management nightmare with their tendency to over reproduce. You could look at stocking a lone LMB which can assist the CC and HSB in controlling the HBG reproduction. Stock one in the 6-8 inch range and remove and replace it when it gets over 14".