I spoke to some deans of California schools about this same concern, and even Harvard's dean; they all expressed that due to the issues from the August LSAT, a lot of applicants are waiting till January this cycle (I am too!)! Do not stress :)!
Michigan doesn't necessarily see that big of a difference w/ LSAT scores once you are in the 99th range (Dean Z said that she thinks its more questionable to retake if your first score is that high). Unsure about NW.