You can book 11 months out with 50 points at the resort you own those 50 points at, then at the 7 month mark call and add to the ressie with the other 50 points from the other resort that you won't be staying at that trip.
Good luck,
BTW, how is Vero Beach? We've never been there and I'm thinking of adding it my list of places to visit. What's in the area to do?