Watch your framing, some of the shots the skier head was out of the frame in the middle of the rail, just take a step back.
It felt like almost every shot was from skier's right and the middle of the rail. Get different angles of the same trick e.g the blind 2 at 1:32, film one from the top then cut to the bottom angle. Get creative in your shots and also get some movement in your shots, use the glidecam to your advantage not just as a tripod. I know you said you weren't confident skiing with it but you can still walk with it.
Lots of your shots where shaky to start then a second before he hit the rail you steadied it, cut the shakiness out or be smooth from when he drops. when you edit it lots of the shots started with him pushing off and a couple of seconds before he hits the rail. e.g 0:49 it starts of shaky and 0:49-0:52 is pointless and doesn't add any thing to the edit.