I would argue putting up a 10 in winds that were gusting to 30knots (and packed a powerful punch) was probably going a bit too far.
Matto,
Stuart and I kited upwind to near the breakwater to get away from the congested area. There was some flatter water close in and less wind. Going upwind and out some distance fully depowered on the 10 was fine for me - but I weigh 86kg.
Stuart, who weighs less, was on his 7 and had plenty of power.
When I came in the wind was definitely stronger, I would most likely have taken out my 7 at that point, hence my recommendation to the guy with the 12 that he not use it, as my 10 was maxed out.
He was an experienced kiter but did get blown off his edge. He came in after a few runs and got his 7.
Incidentally, we were wondering why so many people were kiting on the narrow tack out from the beach, particularly as some were getting big boosts.