The non-spot chubs are bluehead chubs, not creek chubs. The scales are very different and should help you in the future with identifications. The blueheads are likely responsible for your mounds as well.
Those are very yellowfinned and remind me of the fish I see in GA(Michael will have to help here as to drainage) and in the piedmont of the Savannah.
Gerald, in my experience, the fish in any given location are very uniform in appearance with little to no variability save for the size and intensity of coloration differences.
Two species of chub in there then. Cool! Do creek chub not make mounds, or are blueheads just more prone to doing it? Makes more sense now that the yellowfins would be here since I read that they are only really found where there are bluehead chub.