It was chop and wind, 50 m of flat water without wind, 200 m of flat water with wind, 50 m of no wind. I started with M112, did 38knt topspeed. Switched later to smaller board M91 -P7.1 and tribal Symspeed, this board-fin combo is 'allround' for flat water (good on all courses). I believe run 4 and 5 are with M112. The speed didn't improve significant when I changed, but smaller board was easier.