Adding Pinion Angle Shims - Tell Me If This Sounds Correct, Please

Depending on your springs, I think 2 1/2° down is about right. I have angle shims on my car to get the nose about 5° down, but it's primarily a strip car, with ss springs.
I personally throw every pinion snubber in the trash. If it's close enough to the floor to actually DO something, it wrecks the ride, and beats up the floor of the car. In the case of my car, the rear rises leaving the starting line, and the snubber becomes dead weight, waving in the breeze, six inches away from doing anything. Hence, round file.