While the Rod is slightly longer, and can be filed down if wanted on the screw end, it's the longer Spring being compressed into a solid coil, that's causing the problems.

If Spring was shorter and actually had some air space(even just .001) between all the coils under slide recoil, the Rod would have some give/play to use the rear plate as a shock support, and not as a ramming wall, as is now being done with the Galloway setup.