I have a iSonic 122, and I always get spinn out when I use my 8.8 sail and the 46 fin that came with the board. (No problem with the 6.9 sail) My weight is 84kg, and i'm always going for speed. I'm thinking of buying a Drake R13 Race NR 48 , or a Drake R19 Race NR 48. What's the differance between those 2 ? Anybody who has other suggestions ?