The problem with a vacuum is the power it will take and that you need to apply a complete suction to most of the surface for a hold. also if the intake of air is not completely covered that means less pressure and less of a grip. This competition calls for speed so there is going to be some bumping no matter what. That suction might not hold. If you still plan for all this and do vacuum successfully then i tip my hat to you. good luck to all this year!
