It will be interesting to hear your experience with Sherman and his chicklets. I can understand your concern about his behavior, as well as not wanting to loose his beauty. If he's the best you have and you don't have an option to replace him, you can breed him, and cull very hard, hoping that you will get some nice mannered roos in the process. One thing that you might want to keep in mind with such a breeding: IMO, it would be a good idea NOT to give away or sell any of his sons who carry the mean gene! Better to stick those bad boys in the pot instead of dispersing them throughout the poultry community, where they may spread their mean temper about in the gene pool. (Just my opinion.)