I didn't step off the back, I slipped off. I contoured the underpadding to help hold my foot but I'll slide back little by little when jumping and if I don't jam my foot back in the hold, I slide all the way out. I also have a size 9 foot so there isn't a whole lot of traction on the top or bottom of my foot helping out. Maybe I can put more padding behind my feet to prevent them from sliding.
Either way I've already ordered some motocross pants and shin/knee guards. We'll see how that goes in the middle of a humid GA summer.