in lightwinds i sail an isonic 144 and 8.4 north ram and i weigh 83kg . i use two fins- 52cm r13 and 47cm select s10 which is perfect in winds 12- 20 knots. below 12 knts the board doesn't feel very comfortable. in 10 knots i can pump onto the plane but when i stop pumping i can't seem to hold the speed and drop off the plane again. any tips would be appreciated.