Shoulder plane

[nuke99]

7-13 when the shoulder moves on the same downstroke plane as the hands , it provide the greatest support and its best guidance to the stroke.

10-13-0 The flatter the shoulder, the more turn required to put the shoulder on plane ( which means more tilt?)

So which means, the shoulder should be directed to the ball at impact ? With this in mind , how do we in practice and align them with 10-6-A elbow plane (double shift )and 2-N-0 underpitch motion in the downswing? a little confusing ... Bend down more ? or tilt more?

Also another question.

What is the downswing pivot motion for this case?

Also ,, I am feeling Extremely heavy on my hands like something is locking them when i come down, is that the result of correct execution?

Thank you for your help.