Replying to Blind side 270

So i can frontside 270, 450 and switch up, but i struggle with blindside 270's and blind side switchups. I spin left and slide left foot foward so the rotation is unnatural for me but everytime I do them i seem to land backseat. Most of the time my body turns before im off the rail and I land way backseat and fall.

 I've tried the "scissor" thing where I bring my front tip under the rail but it doesn't work.

Any help on how to land them clean with your weight centered?