Here are a couple thoughts. First, get a yellow superfeet designed for skates and ROAD cycling shoes, blue superfeet are designed to be put in a level shoe, a road cycling shoe has an elevated heel, this does make a difference in how the superfeet supports the rear part of your arch. Second, how is your pedal stroke? If you are stomping on the pedals the entire time, you are putting a lot of force on your forefoot, this will cause your feet to go numb. Try working on a more fluid pedal stroke. Lastly, if your shoes are really tight over the top of your foot it will cut off the circulation to your foot causing your feet to go numb.