Skiqt323, it sounds like you have a plan. Great!
I read my old trip report last night to see exactly what had happened to me. I'll share an excerpt of it here so that you can see that you're definitely not alone when it comes to situations like this:
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My Sales Manager told me that the Tower of Terror already had a tentative hold placed on it for the exact same evening that I had wanted it. She asked if it would be possible for me to move my vow renewal to the next night. I knew that moving the date would add a layer of complexity to my resort reservations. I would definitely have to take into consideration how difficult it would be for me to move around the dates of five resort rooms at the BoardWalk Villas during the week of Halloween. That week is incredibly popular with the DVC crowd. Changing even one BoardWalk Villas reservation at such a late date would be darn near impossible.
And so I spent a few days debating between the Wanyama Safari, the Great Movie Ride, and the Tower of Terror. So many venues, such little time. The clock was ticking and I needed to make a decision quickly.
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When this happened, I was trying to change things around within four months of my date. That's not a good thing to do. (*Kids, don't try this at home!*) Had I decided to go with the Tower of Terror venue, I would have had to change my date. And that would have been tricky for a few of my guests since it meant that they would have had to change vacation schedules, airline flights, car rental reservations, and hotel reservations. I, too, would have had to change at least five hotel reservations -- and when they're DVC reservations at one of the most popular times of the year, it would have been impossible. Thankfully, my husband & I decided to go with a different venue that just so happened to have been available on the night that we wanted it.
So, hang in there. Pick a few dates (and even venues) so that when you speak with the FTW folks about the planning of your event, you're prepared. Hopefully, one of those dates will have the most perfect venue available. Good luck!