I've been thinking this since the beginning, but I thought you were just kinda doing this for fun... But you do not need to be here asking for advice - you need to scoot over to the NANFA forum.. There are (at least) two men over there that have been crossing species of sunfish to determine sex ratios, sizes, fertility, size at maturity, max size, etc. for years in Missouri. They have numerous posts, some in very great detail, about their experiences with various sunfish hybrids and using different sexes of different species and the various results of each.
Yup that's how I get information from these two men on NANFA about warmouth hybrids being sterile and also do projects on hybridizing with different species.