I am not sure if the gun data of PP2x has all of the calibration done. I did the guns used for PEx. Alt plus KP+ and Alt plus KP- are used to change the optics calibration. To save the calibration, you have to edit the fifth entry of the guns.csv data
The 7,5 cm KwK 42 L/70 should have a calibrations some where around 11.
There is a known bug in the Sflzf optic that is fixed in patch 1.02 of PEx
(Sflzf optic } http://images.yuku.com/image/pjpeg/cad35b673e61efae5c948c48f49e7f20d152190.jpg
German optics did not use a convergance, so the small triangle to the right is used for the main gun and the one to the second to the right is used for the Coaxial MG.
Allied optics in PE still use the original PE cheat of positioning the optic at the bore of the gun. The Germans are hard coded to the left. Wat needs to be done is a vertex added to the 3D model to define the location of the optical. It's on the list of things to do.