I can typically be seen sailing a JP Xcite Ride 104L.
Sails are either
8.0 3 cam Gun Booster on a 44cm fin
6.8 on 32cm fin
5.5 TR4 on the 32cm fin.
Can't remember which sails are worst for the problem.
I'll try a lower boom and see if that helps.
Cheers
Berowne.