I think these ranking are pretty acurate for the most part, with a few exceptions. The top 7 are solid. Winslow I feel is way too low. They beat Coconino and Mingus lost to Coco. River Valley is much better than what people think. Parker may not make the playoffs and I believe Payson is a better team.
There could be as many as 4 rez teams that make the playoffs. Window Rock being the best, Chinle, Monument Valley and Ganado. Chinle is the second best team from the rez but will not make the playoffs if they lose to Holbrook the last week of the season.
i totally agree with your rankings every one except coolidge. when is their defense going to show up they were solid on defense last year and now they are giving up a good chunk of change against almost everyone.