Why down to the tenth? There was a discussion on Talk Tennis about the issues with the new "plus" leagues where it was hypothesized that there were clusters of players in certain ranges and how, naturally or otherwise, a slight movement of the range for each NTRP level might result in better alignment with those groups of players. With my ratings, we should be able to chart the ratings rounded to the tenth and clearly see if and where there are any clusters.
Here is the chart:
So we don't see any odd clusters. It could be that my ratings aren't accurate and so don't show them, but given my accuracy in predicting DQs and bumps, I think it is more likely that my ratings are pretty accurate and there aren't any significant clusters of players around a particular rating other than the normal large group of players at the NTRP 3.5 and 4.0 levels.