I suggest sticking with what you are using and spin spin spin. You will soon be upgraded to Cat 4 and things may change in competition quality. As stated it's good to test out different gearing based on the event. However going BIGGER will not always results in better efforts as you may not be able on top of the gear fast enough. Sounds like what you have is working. Train more and you'll discover you may be fine with the 48 x 14. Oh yeah, talk to the racers who have raced there for years and see what they use and their style. Each track differs a bit.