I am sure you are well aware of the 60/40 grip, but a this can be reduced even more.
The teaching that I am using at the moment is 60% Non master hand, 30% Master hand and 10% Chest, this allows for a solid grip. As long as the web of the hand if firm into the tang of the pistol then the griping with the master hand only comes from the lower three fingers. When checking your grip ensure that there is no daylight showing between your thumbs and that your master thumb is relaxed (a good way to check if your thumb is relaxed is to look at the thumb nail, if it is pink then it is good, if it is white then you are applying undue pressure).
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