A suggestion from a friend I made at WTAC last year (Lone Wolf Racing) was to make the base plate larger....
Well turns out it was a good suggestion, the load is better spread and when it is attached with some sikaflex it should provide a decent solution for the moment whilst I decide on the final wing choice... The boot moves more on its hinges than it does at the mount!
V2 and V1

The plate now extends to the edge of the boot bracing. It may even be possible to put an eyelet in (through the support plate) and then add some wire supports. May even be possible to put a support from the boot up to the plate or even cut the slot in the supports and run the plate the entire width of the boot.
