I wouldn't worry about the large bass, enjoy catch & release with them...it sounds and looks like your habitat is awesome, let them max out...all of them over 21". I believe you are entering the hardest time for managing them though. Make sure you cull most of the younger generations coming up, leaving a nice balanced population. They need to be of equal sizes for the food chain, while the forage base remains intact. I would like to be in your shoes, pond management at it's finest !