Hi! I am also situated in Helsinki. Nice to hear there are others wingfoiling in Finland. I haven't seen anybody else out on the water, but I have only been going to a couple of spots in western Helsinki.
I have a some backround in windsurfing and kiteboarding, but I am new to foiling, so I have been using mostly the bigger stuff to help get on foil.
There are two of us so our combined quiver for the moment is as follows:
Wings: Slingwing v1 4,2m, Ozone WASP v1 6m.
Boards: Gong Zuma 105l (6,3?) and Sroka Skyrider 5,5 95l
Hydrofoils: Gong Allvator with XL and XXL front wings