Sweet backpins, man. I like to do some too, but not as a setup dribbling shot like yours...mine more or less is a spur of the second shot if I happen to catch a loose ball on a backpin and see the goalie is being a little lazy in coverage I try to "one-time" it, either with the same middle man I've pinned with, or pin-over-pass it to the outside man with a slight cutback brush angle into the goal. My pullside pin only starts as a pin, sort of like a pin reverse to the pushside then pull to the inside guy with either a wrist motion for finesse shooting (50% split) or an open-hand for a loud slammer. There is no way I could compete with a backpin alone but I like to sprinkle them in on the forward 3 bar to keep the goalie honest. On the Goalie 2-bar, I like to do backpins at least 30% of the time because it is easier for me to hit a split or go spray all the way back short while the goalie jumps to the long hole.