Tape a needle to the bottom of the mag sticking out the back.
That should shortly train your big #*% paws to stay out of the way
Actually sounds like you need a bigger gun, I have 2 guns that have been given to me by friends with the same problem of massive hands. One was a 380, It's amazing he didn't shoot his finger off with it as it was so small you could not see it in his hand, his banna finger barley fit in the trigger guard.
One got a revolver the other has a full size 40 that fits their hands so problem solved.
I give a good home to all stray's --- just saying