You should have no problem. I've booked a 1 bedroom at the 7 month window the past 4 years for the first or second week of May. It isn't a busy time at WDW.
I booked a 2 BR at the 7 month window for the week of Memorial Day this year at OKW. No problem! We're hoping for a 1 BR at OKW next May when the 7 month window comes around.
You should be fine. That is my preferred time to go, but school prevents that right now. It is not a busy time and the weather is usually great. Have a wonderful time!