Ihowemt, that's got to be a record in time for one of us not to reply to such request

Some do post the odd furfey (prank request) so skepticism will be viewed on such a request from OS first up

Place the same question under the general windsurfing forum (the one above this)
The crew will give you some good info from there.

Only thing I can add to your request is I wouldn't go too small at 90kg's.
About the 110-115,sounds good unless you have a good skills background, then maybe smaller.
Mineral