Dave Sevigny: "Grip the gun as hard as it takes to track up and down with the least amount of muzzle rise. If your grip is too relaxed, the pistol will recoil too much, track erratically, or it may shut down (failure to feed/eject, etc.). Gripping too hard, by contrast, may negatively affect sight alignment, induce trigger freeze (failure to let the trigger return forward far enough between shots to reset) for multiple-shot engagements and create fatigue in your hands and forearms. The pistol type and caliber will dictate how much actual grip pressure is needed."
....Dave Sevigny: "For me, the support-hand wrist lock is a very important element to help reduce muzzle flip. Because the muzzle lifts during recoil, the top of the backstrap pushes rearward and the bottom of the frontstrap pushes forward. Controlling these two points is critical, and camming the wrist forward accomplishes that for me. Since it stops your hand from moving very much, it stops the gun from moving very much [as well]."