If you book right at 7 months, I doubt you'll have any problems unless there is a special event like a marathon or something going on. I was able to get a lake view studio a couple of years ago for February 2017, but VGF and BLT were both booked up, Polynesian had availability. But, you should also book your home resort at 11 months (assuming it is a WDW resort) just to be safe.