Cheers from Bavaria,
I started wingfoiling last summer with a DIY wing made from an old kite.
I bought a Gong 7m later on and own a 6m Gong Superpower and a 4m Gong Puls now.
I do use a Gong XL Foil (thinking of trying my Cabrinha kite foil too) and ride a 107l 6.1 board.
A 5.9 92l wingfoil board is currently in the making.