BIRDSDROPPING: if its an ave wouldn;t it rise?
Only in the first time in any tier.
It's not a plain average but the average of a limited number of your best scores, 25 as a TP. We call it "saturation".
You're well past this number, so your pool of 25 will only change when a better score replaces a higher score: No more rising average! OTOH, also a score higher than the average may decrease it if only another even higher score is in the mix.
Sidenotes: threshold to Master is 67, then the numbers will be reset. Shot numbers count, 9 hole scores are doubled, Par3 or Par5 courses aren't counted in.