Try this.
With the two-hand grip, some shooters use a tighter grip in the shooting hand than the support hand which results in 4th and 5th fingers pushing the 3rd finger tight up against the bottom of the trigger guard. This also tends to move the front sight when striker is fired and opens up the shot groups.
Instead, your shooting hand should assume a firm (not tight), but relaxed grip on the grip with the support hand matching the fingers in front of the grip with the palm cheek making full contact with the grip (5th finger of support hand should fall just below the 5th finger of the shooting hand).
Now, grip your G22 with both of your hands. You should feel equal pressure from both hands yet almost not feel the bottom of the trigger guard against the 3rd finger of the shooting hand.
Here's the important part. While relaxing the shooting hand fingers, push forward with the shooting hand's "V" and bottom of the palm and pull back with the "hook" created by the 2nd-5th fingers of the support hand. This will result in a very firm yet stable grip with relaxed shooting fingers and "fully independent" shooting index finger to press the trigger.
Now, raise the sights to your eyes and verify that the grip/pistol/sights are still and not moving (it shouldn't). Applying a bit more pull/push will further result in a tighter grip without shaking the front sight. When you press the trigger to release the striker (fire the pistol), your 2nd finger of the support hand should be pushing the 3rd finger of the shooting hand hard against the grip and not against the bottom of the trigger guard (actually, the 2nd finger of the support hand should be buffering against the bottom of the trigger guard).
As the pistol recoils, your hands/palms should move together as a unit with the pistol/grip. If there is any "biting or snapping" of fingers/joints, then it means the pistol is moving independent of the grip. If you still cannot minimize/eliminate the bite/snap on the 3rd finger of the shooting hand, very slightly move the 3rd finger down, away from the bottom of the trigger guard as you apply more support pressure on the 2nd finger of the support hand (support hand's 2nd finger should have the first joint/knuckle under the trigger guard).
I hope this helps
