[EdZ]

As a drill/image - check your impact fix, that will help you stay steady with the head position, and focus only on keeping the right wrist bent back, driving the right palm down to a spot in front of the ball.

Keeping the right wrist bent back will 'cause' the right shoulder to have to go down plane more, as it should, to give you more right arm.

Start with just punch shots to both arms straight (checking the right wrist bend) then move to a full finish swivel.

Post some more clips when you can, all the way to the finish. Hold your finish, check your balance.