If the original question still remains, I offer this: The cover you are considering is going to be a bit larger than the specs. Every cover that I have bought has been larger than the designated size and I have had it over hang the top of the pool. I found the only time I experienced the cover blowing around was when it had to hang over the of the pool. When it lays flat on the pool surface, it stays in place very well.
Search the forum, there are discussions about what people have done to stop a reel from sagging.