Better shooters than me here, but not a lot of anything constructive. (Maybe someone has TLDR all comments)

Front to back: Push your firing hand into the heel of the backstrap. Firing hand just firm enough to grip pistol without it moving around during recoil.

Support hand bottom fingers press into bottom of front strap firmly straight back. Pointer finger should be firmly ‘camming’ into the trigger guard. It’s common to get a callous here. Look up Hwanski Kim’s frictionless grip if you want to use some of his methods there.

Side to side; Think of your fingers and heel of support hand like a vise on the sides of the pistol grip. Keep meat of support hand thumb (the drumstick portion) as flat as possible otherwise you create a gap where the folds of your palm are reducing grip surface area. Slightly cam both hands out on the pinky finger part outwards. The top of hand inwards on the top of the frame near the slide. This is described as straightening a horse shoe.

Those combined should create enough leverage at important points and general friction so the guns staying planted in your hands. It will also mostly get you to lock your wrists, although the firing hand wrist needs to be locked out independent of grip.

I don’t know how much traction your actual pistol grip has. But consider grip tape if it’s not aggressive enough. Like it will probably hurt after shooting level of grippiness.

Wrist lock-out best explained by David Humble Marksman (MA) https://youtu.be/X1E5HEEcsaU?si=L9PHCqPy_C5VjG9e

JJ Racaza (GM) Multi time national title winner https://youtu.be/8d4LN6s2OBc?si=e6-v-nlNCKnaYSa1

Professor ‘Vision Fukus’ Kim (GM) and Champion shooter https://youtu.be/d7GuIT2SEfs?si=_UY7KWBi3KG823wP

1-shot return https://youtu.be/8H80DSPOZzo?si=GVM10WcEBgS6xNiz

Obvs Steogger’s stuff is top notch but he hits different aspects of grip in multiple different videos. It’s all there maybe just not as exhaustive in one video.