yeah you dont need to center mount ur skis or any of that bullshit, though it might help a little. I would try to dig out your rail a little bit though because you do have to tilt your skis to change your momentum, think of it as gripping the rail, it feels like you are. dip the toe of your front ski down and if your on a skinny rail dip the heel of your back foot over the other end and it will help you spin the other way. also when your first learning them dont set the 270 crazy hard try to set it softly so you can start the spin the other way easily.