We just went last Sunday night on a whim and were able to get a PS easily and then walk right in an hour and a half early. It may just depend on which particular days you're trying for. Also, the middle of Feb is starting to butt into the very early days of spring breaks.
Not sure what is going on...but various Canadian Universities have their reading weeks throughout February. Mine is Feb 13-18. However, university students tend to go to South Beach, so not sure if that might be the reason or not!! Either way, can't wait to do it!