[smooth]

A couple additional areas to check at setup that can contribute

an overly wide stance

a left foot that is too 'square' to the line at address

A right forearm that is too high at address (bad grip)

Shoulder line open at address

All of these limit your ability to pivot properly.

Hit some shots with your feet together until you can stay in balance.

Yep checked those things and all seem ok with mirror work e.g. left foot fanned, right forearm on plane. Seems i just can't get my mind to get the down instead of out...