Scalping is never ideal. I am just saying that doing it once and getting it over with is better than removing more than 1/3 of the blade over and over again. The Bermuda will survive... we often scalp it at the worst possible time, early fall when it is trying to put up energy stores for the winter.... for over seeding with winter rye. I think if you look at my earlier post, I said to live with it this year, fill in some of the worst low spots with 1/4 to 1/2" compost. Scalp and level in the spring. That would be ideal. It is very cool here too for the time of year but I doubt it will be cool enough to send bermuda into early dormancy. I may shift my last N app up a couple of weeks however.