if you're doing a frontside 270 off and sliding right foot foward you want to scissor your skis so that your right tail is down and your right tip is up, this will give you a grip of the rail and you will be able to pop the spin off. for backside right foot forward, same thing, scissor your skis but look the other way and get that grip so you can pop the spin off. once you are able to get that scissor down and you can lock in, spinning off will be a lot easier both directions.