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Gorgo said..
What's the bit of plastic on the mast plate?
If you mount the Foil Mount on a board with bottom shaping (such as "V") then the Foil Mount will follow the shape of the bottom of the board (as long as you are using the "Ridge Mount"). So you need to fill in the areas for the Foil to mount onto so that it is flat. I did a shocking job of this with rail tape which has lifted in some areas. This is what you see in front of my foil. The mount I did on my 5'6" Raptor ST and GL Fish worked much better. I will peel it off and do it again one day.
Ride safe,
JB