Well, Kentucky sometimes blew with the wind.
Back to the question. I don't know of any way to install an adjustable rear sight and keep the gun in "stock condition."
I suggest first trying various loads and see if that makes a difference.
But I will, very hesitantly, mention a technique used by factories and some old time gunsmiths, bending the barrel/frame. That requires a very stiff vise, heavy bushings and a lead dead blow hammer. It is very easy to mess up and create a gap at the crane. But it can be done and solves the problem.
Jim
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