You wrote-: "Please read 10-6-A. Tell me which pics are the "flattest normal plane"?
What are you trying to get at? I have no idea.
In a general sense, the flattest normal plane at impact is dictated by the club - it is the plane that allows the lie of the club to be "normal" (sole of the club to be horizontal to the ground) at impact, so that the the heel of the club doesn't hit the ground first.
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