Alternatively, if your trip straddles a weekend and weekdays, you could book the harder part of the trip to book (probably the weekend) with BLT points at 11 months, and roll the dice on the remainder of the trip at 7mo and book the weekdays with Poly points. Ie book a split stay in 2 parts, and then link the reservations after. Or, as above, better idea might be do bank or borrow BLT points so you have 200 BLT points to book with at 11 months.