Gday Kraut..
Tricky.. Not sure on how powerful wingding kit is.
The scope and especially size range has grown massively 5-8 m not unusual...
Suggest posting in SUP foiling forum.. A number of really knowledgeable posters..
The key to windwing is getting up on the board when u have a sinker.. I plan to start with 110 to 120 litres.. Have kept SS i76 (1550 cms2) to have crack with WW.. They are excellent in gusty conditions when kite would be really tricky..
Have fun..

Cheers
AP