Replying to Help on rails

hey guys im coming to you for advice. Im a fairly good skier , im pretty good at jumps. im not afraid of doing flips over big tables and stuff but there is one thing that is pissing me off. I suck balls at rails. I mean I can slide pretty much any thing that is put in front of me from that box 4 inches off the ground in the kiddie park to some pretty big urban rails. but i cant do anything else. I cant do switchups or any form of 270 or any other tricks on rails for that matter. I just dont feel them. Its like once my feet are on the rail  they will stay there until they hit snow. I absolutely dont understand how someone can become good at rails .


tips and advices welcome


(I am aware I said i sucked balls at some point in my post dont get back to me on that one , its not litteral )