GoPro it so we can actually hear what is happening.

Haha you are taking us all over the place champion.. first feeling like fuel splutter NEK MINNIT self-diagnosed sensor splutter

How do you know fuel pressure is GOOD.. what are you reading? At high rpm maybe your fuel pump cannot handle the sudden 'go' that you are after. This may be it IF whilst slowly accelerating, your fuel pump CAN handle this but CANNOT handle quick response WOT.

Goodluck