DVC seems to have shortened their deposit window significantly these days; I just confirmed a 1BR unit for early April this past week. Because you are very flexible about dates and resort choice, I think something will come through for you.
While the DVC deposit window is shortened to about a 5-6 month window, the need to start an OGS really early is important. If there's too many people in line ahead of you for all dates on your search, you'll never make it to the front of the line for a match.
That's a prime time for school vacation trips, so you may need a higher Trading Power than you have available.
We matched for the first week of November at SSR. The match came through in early-May, but we started our OGS in January. Even then, we'd given a 3-week range of dates and would accept any DVC resort, but still ended up with a match for the final week of our acceptable window.
So matches for April probably started coming through in October. You may be out of luck.
-Rob