If you're serious about raising BIG largemouth I think you should consider a mandatory slot harvest. An example would be to harvest all LMB between 11-15 inches, in particular individuals with less than fabulous body condition. These intermediate sized inidviduals often eat smaller LMB, so you shouldn't have problems with future recruitment.

BTW, you probably don't see a bluegill "stunting" problem because of the heavy pressure that a high density LMB population will put on young of the year BG. If you put heavy pressure on intermediate LMB then you will likely see more small BG. This can be a good thing for encouraging good growth rates on LMB.

Holding a redear sunfish is like running with scissors.