Yeesh, 13 nights is a lot. Is it during the Christmas season (early Dec) or actually over Christmas/NYs week? If the former, I’m not sure luck is enough:/ it is the hardest time too book most rooms on property and CCV is arguably the hardest (with VGF as a tie). If the latter, maybe a slightly better chance because it’s more expensive to go then and the Sorcerer pass AP is blocked out then, there tends to be a bit more availability. But still slim, especially with studios.
My only advice is to do what you’re already like of doing: book what’s available and stalk obsessively and keep track of the dates you need so you know exactly what dates you have v what you need. I’d also recommend doing single day waitlists instead of a full block of days. Single days fill faster and then once a date is filled you can waitlist the next. I was able to string together a studio 8nt stay in early December this last year at the 10 month mark (we became CCV members last Feb), but it took a couple months and a LOT of stalking. This year I only tried the morning of our 11th month mark and got nothing, but a couple days later got 2 nights. I haven’t tried since because we’re not likely going for the holidays this year anymore so I’m not sure how difficult it really has been this year.
Also 1bdrms will probably be a bit easier to get than studios so if you can seeing that point-wise that could be helpful too.
Good luck I hope you get at least a split stay- CCV at Xmas is SO worth the effort!