I think this is a pretty solid stock move. But if you were going to try and get more shaft lean, you'd want to work on the lead shoulder blade pull through impact. If you watch the little clip, you'll see during this phase the lead arm pulls back and the trail arm goes into internal rotation as the trail elbow stays along your hip. So it's a little bit of wipe training and a little bit of don't break my arms. Check out this video, I think it will help tie them together.
https://www.golfsmartacademy.com/golf-instruction/block-trail-arm-throw/
Good luck,
Tyler