Thanks for all the suggestions, It is a straight grip gun, and I do pull the trigger with the tip of my finger.
I can place my hand back further on the grip if I shoot the rear trigger first and that stops the trigger guard from hitting my second finger, but I than have to stretch to reach the front trigger and then my second finger gets hit.
When I reach the front trigger with the tip of my finger that puts the rear of the trigger guard tight up against my second finger and I don't have small hands, my fingers might be slightly thicker than average though.
Pete