How did it go agrelon? I also have a softdeck between the mast and front straps (on both sides) and I believe it comes from hitting the deck with my heel after I suddenly come to a lull and try to take out my foot out of the strap asap. It could also happen when my waterstart is not so good, so the wind pulls me quickly from the water. The deck is not yet peirced, in few days I am planning to replace the damaged PVC layer, insert some urethane foam to the EPS foam and put some new glass clothing. Not in the mentioned order, of course.
Based on this experience, I have changed my style of riding, paying a lot more attention to move in smooth and soft steps around the board.