Newbie binding question

[Dave R]

I'm trying to teach myself to slalom using an O'Brien performer ski with a 775 front binding and rear toe strap. I've got the starts down and was working on my turns when I cut accross the wake and my rear foot slipped out. I did a split stretched my hamstring and hyperextended my knee. So I'm limping around and thinking about putting another 775 front binding on the rear instead of the toe strap. Will this work? Will it help prevent injuries? My wife will freak if I spend big bucks on another toy for the boat, so I'm looking for cheap solutions until I'm a better skier.

Thanks
Dave 04 X30