I would like to add some extra fins to my LW Door board as seen on some other models. I'm thinking of 2 7cm fins on heel side just behind the footpads.
Drilling trough the material > filling the side of the hole with epoxy to keep the water away from core and mount the new fins, is that it? I would use plastic washers under the bolts to protect the top sheet.
Would the 2 big fins make any difference? I assume that the side effect could be more drag but upwind performance should improve.