Argh, my fault Green man!
I wrote with my brain disconnected at that time .
I meant of course down under the plane:
The right shoulder must not drop down under the shoulder plane but must drive down the shoulder plane!
What a hawkeye Lynn! I corrected the post!
By the way, thanks again for all the valuable instruction you provide here; with your help my game improved a lot since my first post and I can tell you my ball now knows what lag and compression mean!