[Mike I]

I would only suspect the screws to be the problem if the cracks are coming out from under the top frame where the attach hardware is located. If the cracks are running across or near the hardware location, but not going up under the frame, the cracks are not likely being caused by contact with the screws. Post a picture or two, and let's take a look.

Another thing to consider is the side mounts holding the windshield in place. If the mounts were not properly shimmed to the steel support hoop behind the instrument panel, that would surely induce torque in the windshield that would cause it to crack. I know from experience on my own E-M and Tom Wells' E-M that the thickness of the shims required is significant (1/2" or more).