Two hands, right index finger on trigger. Left thumb under right thumb. Same essentially as my 1911 hold. And I'm shooting single action...DA only dry fire so far...that is going to take some work. I'm conditioned to 3# triggers. bob
Groo here
First, you are holding the gun incorrectly.
Grip the gun one handed as you would grip a hammer[thumb DOWN]
Then cup the other hand around the shooting hand with the offhand thumb over the shooting hand thumb.
The shooting thumb over the off hand thumb hold was started by
Target/speed shooters using autos greatly modified for this grip.
1911 pined grip safety, enlarged thumb safety and often a secondary off hand thumb rest forward called a "gas pedal".
Completely incorrect for revolvers and unmodified 1911's.
Also most people hold their guns too tight.
A tight hard grip works if ranges are short, you are shooting fast and trying to over power the gun.
Not so good for accurate ,distance shooting.
Shooting small groups, or distance hits require "sameness"
Same grip, hold, sight picture--allowing the gun to "kick" move the same each shot.
Old shots of Keith [hats off please] ,a long distance shooter for sure,
allowing his 44mag 4in to kick out of his support hand.
The same rotation you would get if shooting one handed.
Unless you intend to ONLY shoot 2 handed ALL the time,
Loose the shooting thumb over the offhand grip....
The guns just will not shoot the same place when shooting one handed[magnums or hard kickers]
For the finger , Rubber grips that fill the space behind the trigger guard
and stop trying to keep the gun down, role with it instead....