The Pro-Shot does not have the end sized with a small bushing with a hole diameter to match the diameter of the cleaning rod like the Lucas or Jones...
I have multiple tips for mine. They do not match the rod diameter, but rather the bore. I also use Pro Shot rods. I have experienced no flexing inside the bore.
Further, I am hjaving trouble visualizing how a hole the size of the rod diameter will allow a patch through. Are you sure about the size?