I'd suggest that your issue is here:
As you stand up, you're bending over from the waist and that's destabilising you.
If you can drop your hips and raise the elbows, that should help you straighten your back.
Also don't look down at the board...
Check out Clay's recent YouTube video series on the pop walk up.
Nice Oreo Biscuit technique, though 👍
Commented on Small day and a lot of board to bring...
31 Oct 19:42
Nice 👍
Now just get the front arm out of the way so you can pass the coffee back to the foam...