I ran one for awhile (mounted of the side of my C-more) with ok results.
It was mounted high up so my thumb was about 30 deg of horizontal which inabled me to get more force into it.
The down side was my c-more scope worked loose every 1k rounds even using red lock tight plus I over drove the gun.
Wrapping my weak hand forefinger around the the front of the trigger guard works better.
I have shot like this for years. Try putting different amounts of pressure through you forefinger and see how you go.
See about 11:35 into the following video.
https://www.youtube.com/watch?v=ChSazF41q-s
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