Deff cutt harder... Darin Shapiro once told me for s-bends: don't edge at the wake, edge so hard your aiming away from the boat!
The main thing I saw in your video, besides speed, is that you went for the trick REALLY EARLY. Do some raleys where you kick them out and putt your head DOWN. A normal raley your head is up looking at the boat, but S-Bend raleys need to be practiced with HEAD DOWN. Then when you progress to trying them, you put your HEAD DOWN and into your backside ARMPIT (for you, left armpit,) but you still throw the raley first THEN roll into the s-bend.
In your video, you tried the s-bend rotation so early that it comes out more of a HS front flip. People call those "Fresh bends" because they arnt really front flips or s-bends, there just a sloppy hybrid. Commit to the raley, then roll into s-bend.