get your mastffoot placed further in front. As well you should fix the footstrap on the outside at the back. Which finsize are you using? Perhaps the fin is too short. I would recommend a 34 for Slalom.
Whatīs your weight? Your mentioned sailzises fit perfect to the board. Do you use really long harnesslines?
Just come back with the infos letīs find out the reason, why you feel uncomfortable on the Isonic 86.
All the best,
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