Here's some video taken of the Windtech 57 ( 90ltres) last Saturday.
I'd been out 1.30hr in patchy crappy stuff so I was pretty tired by the time we got some decent gusts. The board is c 25 ltres over my weight.
It was getting to the top of the range for that combo so I was backing off a little at the biggest ramps to keep it on the water. I was surprised to see how lively the board looked in the footage as although it was hardwork it was fun

, I was comfy and I had no control issues. The gybes weren't pretty but I was happy they were dry..

I wasn't getting forward enough to engage the rail so I lost speed but it was happy to safely bounce around in the bumps.
If I had stayed out I would have come in and put more tailflex on , mastfoot forward , a smaller fin and gone down to a 5.7m but I was too tired so I only had a few more runs after lunch and went home.
I'm not good enough or dedicated enough to sail a slalom board above the chop but I can have a heap of fun on a forgiving setup like this!