Replying to 270 onto streetstyle

I can 270 fine onto flat rails and boxes of any kind as long as the jump goes straight onto it but i can't seem to get the 270 onto a down rail with the jump to the side. I can get the rotation but when i land on the rail i slide out and hit my side (which hurts). It might have something to do with the fact that i slide rails left foot forward and spin left so when i spin onto rails i go from the opposite side of the rail im used to sliding but im not sure. Any tips to help me out?