Hey Marco, I recognize your problem. Maybe you can try but giving the fin more rake or using a smaller fin (with more rake) definitly can help you gain looseness for the iSonic slalomboard. I have good confidence this will help, definitly because heavier riders DO go fast on your equipment.
Its a deep tuttlebox, so there should be a bit room to pull the fin more raked. And don't care if a few mm of the fin head stick out at first.
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2011 Starboard iSonic woodcarbon 107, iSonic speed special W54, iSonic speed special W44
Severne Reflex Sails