If you are staying at a WDW resort, it may help to put Le Cellier on one of your last days, or any hard to get restaurants. The later the date past the 90 day mark, the less people have access to booking the restaurant.
Example, I did this last year. I had Le Cellier as my 90+10 day being Sept 26 but when the CM plugged in the dates she accidently put Sept 19, our 90+3 day... dinner was all booked!!! But she realized the mistake and on the 26th I was able to have basically anytime I wanted.