Who besides you has mentioned a parallel shift/tip position? The comparison being made here is a straight stroke along the straight line angled for spin/squirt/throw vs. getting the tip to the same place, along an arced path designed to be moving in the same direction at contact....a parallel shaft/tip position is inherently very inconsistent WITHOUT factoring in deflection and throw. It's a guess.
P.S. It's all "a guess" no matter how you make it - some ways are simply inherently more consistent than others (guess which).
pj
chgo
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