I went through the same process last year. It was only a small contract, 50 points, but I really wanted to own only at BLT. I bought VWL to become a member so I could add on at BLT in smaller increments.
After only 2 months, I knew I really just wanted BLT and sold. I knew it meant a slight loss but am much happier. At first, I was going to simply handle the loss by replacing the 50 VWL with only 32 BLT (that is what I could buy with the check I received from the sale after commission and fees). I didn't (as I knew I would be buying them sooner or later). I had also gotten a trip out of the VWL contract before selling so that helped.
I don't know the size of the contract and the loss you would be looking at, but since BWV sells for around $20.00 less than BLT right now, you might be able to still end up with the same (if not more) BWV points than you currently own at BLT. And, if this is the case, you really haven't lost, but rather just paid more for BWV than others.
Of course, MF"s at BWV are more than BLT, but if having that 11 month window to book at the resort you know you want is important, that has to be considered as well.
DVC is for the long term and over the next 10 - 20 years, will the loss you take now really be that much if it makes you happier?
Just a thought...good luck!!!