Shifting back to EP... getting steeper etc

[PingG10Guy]

It's been a while since my last post, but Im at a point in my swing where I need to figure out how to get back to elbow plane. Im beginning to think it is a wrist issue at the top. Here's some info about my setup

Strong DA grip
Rotated(impact hands but Left wrist is bent, Right wrist is flat)
Body lines parallel to the target line
rotated shoulder turn in the bs


Since Im already setup with the hands to cock on plane, shouldnt there be a noticeable amount of bend in my left wrist at the top of the swing? If I have a visually flat left wrist at the top then Im shut.
What is keeping my left wrist in the correct position from P1-P4? The back of the left forearm?

Here's a vid