Exorcet, I'm sorry, but it seems like you're just talking a whole lot of nonsense.
Faith you've done a good job finding a formula to describe turn radius, but you don't seem to understand the practical application. I get a whiff of BS when I read your posts, so you might hop off the high horse. A "high performance turn" is not completely different, it can still be approximated by the same equation you used before. Bank angle, CL, and G necessarily increase, and by including the changes to these coefficients (CL changing with a variety of factors that would require extensive testing to determine,) you can effectively describe a wide variety of turning performance scenarios.
It has little or nothing to do with "elevator" effectiveness (available pitch moment) in a modern tactical jet. Nothing designed with that kind of maneuvering potential is going to be limited in the heart of the envelope by control deflection, rather by deficiencies or compromises in wing loading (read: effective lift production,) thrust to drag ratio (sustained turning performance,) or structural integrity. (Think Tomcat with F110s... so much potential limited by a 6.5G airframe.)
It means there is a potential for poor sustained turn performance, but that's not something any of us can determine. That's the stupidity of making wild conjectures about the performance of an aircraft not yet well known. The F-35 could have very effective aerodynamic performance, producing a higher coefficient of lift per square meter of wing. It most certainly utilizes some wizardry that previous generations of fighters did not. Just visually compare the design of the wings... that should be enough to tell you we don't know all that much.