The one thing FTP does for you in a race that most don't account for is it keeps you fresh for the final surge. In the 5's at least half the field can't maintain the final lap pace so try to get to that final lap fresh (i.e. stay near the front, don't pull) and just hang on until an opportunity arises and you'll be fine. A lot of guys win the sprints in the lower levels just because they are there at the end and jump on the right wheels.