Well...ok, here goes, you were Crewing, which means you were trimming the main going upwind and the kite going downwind, right?

Did you edit out all the 1000 times you looked up at the main going upwind and leading edge of the kite going down?

I usually tell my crew, "If I look at you and your eyes are not on that kite luff, I'm going to punch you in the head! DO NOT take your eyes off that kite luff!"

(any wonder I can't get crew?)

Maybe that's why your kite luff was too tight? At least it didn't collapse, which is even slower...