I asked about UY a few days ago and Doc replied that if you travel around the same time each year try to get a UY just before you travel so if you cancel you will still have plenty of opportunity to bank points if you need to.
UY has nothing to do with when you make a ressie. As long as the points that you need to stay will be in your account at the time you check in (11 months after making ressie) you can reserve 11 months ahead.