For Adventure Season, your best bet would be late January or mid September (after Labor Day but before the start of Food & Wine). Dec 1-14 will be very difficult: cheap points-wise plus all of the holiday decorations and festivities make early December one of the most popular times for DVCers.
For Choice Season, F&W runs from late Sep to early Nov which overlaps with most of Choice Season. Your best bet might be that one week lull between the end of F&W and whenever families generally start arriving for their Thanksgiving trips. From Thanksgiving through New Year's Day will be very busy.
So out of those two Seasons, there are probably 2 weeks in January, 2 weeks in September and 1 week in November where you would have a pretty good chance to book BCV or BWV 7 months out.
I called 4 days prior to leaving for a last minute mini trip and was able to get a standard view studio at the BW. This was for the 7,8,9 and 10th of May.
We have never been in a situation where we were unable to be accomodated.