Proper hold on Hi Power?

[Gil Boyd]

Now if I was still doing my instructor bit here, I would mention that your grouping on target using that hold could be all over the place.
Now that I know you are not cackhanded but righthanded from the photos, concentrate initially on firing holding the pistol grip firmly into the strap between your right thumb and first finger, push it back into that as tight as it will go, and fire with one hand.
Assess your hits on target and then shoot as Peter suggests cupping the base of the pistol grip and schrolling around your right hand with your left, you will then see the benefit of a tight and firm hold.

I would go further also, in suggesting that you try locked arms out front and also slightly bent arms and then also assess your MPI and the best one of those two holds for you.

The reason it has stayed so long in service is simply it is one of the best handguns in the combat role, and will never let you down as long as, like every weapon you clean it regular.
Good luck and get someone to video you cracking off on the range from the side and also learn for that method too.