Classic, I was using my S B 2.1 only for the second time today in a 16mph off shore breeze and the thing frightened me to bloody death. Serious Pull and a brilliant day.
Looks like the kite is taking you for a ride more than the opposite. I've got a 2.1 too and it has a lot of pull but I've got a bit more body weight than you and it still pulls me around.