Is there a simple way to see how many RR's I have played as a TL...
There's one simple way, and a few not so simple ways:
1) Compare the current RRs to the number on tier promotion (if you've written it down somewhere).
If you have no note, you may only see if your TL average is saturated @750 RRs or not. You are above saturation when
2) you have experienced a period of "unnormal" plunge in the average, regardless of not-so-good scores,
3) or if higher scores (like the series of 33s / 66s you had Tuesday) did not raise your average. What happened on your 72 score on Monday? If should definitely have moved your average up unless saturated!
You may also voluntarily post another round of 36 / 72 and observe the average for the same effect.
If you're into maths, you may
4) observe subsequent scores and averages over some period of time and set up a spreadsheet calculation of the probable no. of scores.
Or, just be a happy player enjoying the games without fixating on the big moment. You have still some way to go to reach 59 anyway...