Congrats on making Tour Master aftertherain.
I have just made it to legend. As a TM I kept a record of how my average went down regarding my scoring.
Here are some examples of how my average went down.
Av 68.70 scored -5 av went down to 68.50 (on 9 holes)
Av 65.48 scored -3 av went down to 65.44 (on 9 holes)
Av 63.56 scored -9 av went down to 63.50 (on 18 holes)
Av 61.32 scored -5 av went down to61.30 (on 9 holes)
When av got to around 61 only a score of -5 would lower my average ( on 9 holes, or -10 on 18 holes). I hope this gives you an insight to what you have to do to reach legend.
All on par 72`s (edited after reading alosso`s reply). Only a rough guide for aftertherain, that`s all it was meant to be.
Best of luck, hit em straight.....bladelad