Bluegill are too fecund to have them at the top of the food chain. (Unless you want to try to manage a single-sex pond.)
You will need one top predator above them. Perhaps HSB would be a good option? They do not reproduce, so you could manage their numbers as needed.
Lots of people on the forum have managed a pond that is optimized for bluegill. There are many threads in the archives. Hopefully, some of those experts will also drop into your thread.
Good luck on managing your pond back into a good fishery! With your background, I hope you will enjoy that process.
