Wich size will be better for wind range 5-15knt on snow and 8-20knt on water 9,5 or 12,5. What woud be max wind for hard snow to hold a 12,5 ? My weight 77kg good on snowboard, kiteboarding - just started on end of thiss summer. I tryed snowkiting with NWP5 that was easy, but NWP5 has no power on the edge of window.