I've seen two ways of doing the Rayden flip: 1) treat it like a front handspring at the beginning with a tuck at the end; 2) treat it like a neck kip off of a wall.
The first method involves the typical shoulder/arm blocking technique you would use on a front handspring, along with a strong heel-drive to initiate the rotation. Once you have sprung, you will tuck to finish the rotation (otherwise your momentum will carry you into the wall).
The second involves jumping and ducking such that you land on the wall with your arms cushioning (think dive to kip) then you will heel drive straight up while pushing hard like a kip. At the end you will again tuck to finish the rotation.
From the video, it appears you are not driving your heels or pushing your arms hard enough.
Best of luck. Train safe.