I can't help suspecting that when JF was using that particular formula he wasn't making turns with less than 60° of bank, or as slow as 150 knots all that often.
You may not know his name down under, and I hope John will forgive me blowing his trumpet for him. JF is a very distinguished test pilot, with a 20 year record of test flying British jet fighters (when we used to build them unaided) - and inevitably as a company pilot, displaying them as well.
This of-course assumes that he is who he says he is on Pprune, but I am happily convinced that that is the case.
G