Just thinking about the hand mechaics involved, if you have the thumb around the back you are using a pincer-type action with all the force from the fingers being countered by the thumb counter-force alone. But if you have the neck more in your palm, you are bracing against the palm, and the thumb does nearly nothing requiring force because you are using a more of a fist-type grip.
One good thing about music is that when it hits you, you feel no pain - Bob Marley
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