I just tried again to start a new thread with poor results. I don't know where they are going???
Anyway, I just got an 05 F-Type 148 and was sailing it in 10-15mph with some chop (<1'

with a 9.4 V8 and the stock (56cm) fin. I weigh 185lbs.
I was having trouble moving up through the gears and moving back on the board. I would generally head up or even spin out. The only way I could stay on a plane was to head way off the wind and stay there.
Do you suspect this is pilot error? Any suggestions? Is it possible that the stock fin isn't big enough for the sail?
Thanks.