bsatov01:My ranking/average has been stuck at 69 for quite a while now.
Interesting enough, you have had plenty additional influence on your average. Didn't you notice the changes?
In the 13 ranked rounds you played, the best score is a 69, and the calculated average is 75.5. Thus 6.5 points difference should result from matchplay against higher tiers (not level or average) or credit wins.
Having said that, at least the last two rounds of 70 and 71 should have lowered your average, too (subtract the offset above in the average calculation).
This looks like a steep slide towards Master - my best wishes for that feat. I hope that you are prepared to buy some new equipment then, all except the putter may need replacement eventually to adapt to the longer tracks. (Give it a try in a practice round, "hard" tees). Good to see that you have the right level for the G20s.
Have fun!