Is the configuration you have in your last picture with bearings in place? Try the proper fixed cup instead, just for giggles, and see what the result is if you haven’t already done so. It might be the spindle dimensions are not correct for that bottom bracket also. I had to search out a correct spindle for my Tommasini since the 70 SS would not fit correctly, and that bb needed facing badly. The LBS owner/mechanic has the complete Campagnolo tool selection and he did the deed in a morning, along with chasing the threads on both sides properly.

Don’t take it that careful QC inspections were done, its a different world now. (From real world quality control engineering experiences.)