I work with a lot of outdated films. Both Konica color films and Shanghai GP3 black and white deteriorate in really remarkable ways. I never see anything like this with Kodak, Fuji, or Ilford (or former east-bloc films). What you are saying in this post about the importance of finishing, and how complicated it is, has me convinced that their problems relate to a poor understanding of stabilization. Except for stability, I find both films otherwise quite good.