Do an actual 20min or hour test. Apply 90 to 92% to the 20min test. Nobody outside of some of the faster 33 forum racers will be able to replicate 95% of a 20min test. Pick a flat route and just try to TT for the effort.
Then do the workouts, group rides, races.
Also, always a grain of salt. People do cheat.
I haven't done any races because I don't like their prescribed race zones of ABCD. I think they need to split them with numbers also perhaps. Keep D and C. Have a B1 and B2. Then an A1, A2, A3.
Basically, I feel "stuck" being too fast for one and way way too slow for another.