I'm having yet another issue, my board slows down like crazy after a few runs. I wax my board regularly, and for the first couple runs it does great. Then it begins to slow down, and I can feel it. It feels as if there's something that doesn't slide on the front of my board, around the nose. I'm not looking to go crazy speeds here, but it's noticeable how everyone is going faster than me. The only thing I can think of is maybe I'm leaving wax unscraped, but I'm quite sure I got all of it so I really don't know... Help!