Sunil has interpreted my post correctly. It would likely take a very high density of HSB to make a significant impact on the carp population.
I've always fed my HSB a 7.5mm or 9.5 mm feed. My ten-plus pound HSB had no problem converting this size pellet. I'm not sure why bigger would neccesarily be better, unless it was cheaper. I guess the bluegill would leave it alone if the pellet size were huge. I'm not an expert on fish nutrition by any means, but I've always been under the impression that higher protein feeds meant less waste, which in turn could have some impact on overall water quality. Bill Cody would probably know a lot more about that issue.
I'd really like to know if anyone has done any scientific research on how vitamins present in fish feed impact growth rates and longevity. I'd certainly be willing to pay a few more pennies per pound to give my bluegill a little edge in that regard.