Yes, you can put too many. Since your fish will be pellet fed, the need for FHM is less. I would say any more than 5 pounds is a waste. A summer of spawning in a pond without predation and 2 pounds will be many times that...
If you are only going to stock the HSB, I would stock a few more, perhaps 20-25... As has been said, CC in the 8"-10" range are easily to find and fairly cheap, so they can always be added at a later time. Just putting 1 LMB into the pond with the HSB would work well. It's amazing what 1 LMB can do to help control the few HBG F2 spawned in a 1/4 acre pond.
