My big reproach on Efke films is the bad quality control. You have often pinholes and scratches in emulsion.
I have tried Efke 25 in PMK following Ed Buffaloes' recommandations. It's nice.
Concerning the Efke's machinery, the coating machine is very old : she was built in 1949...
WHEN did you have that problem? Some years ago I heard about it, tried about 15 rolls in the last weeks, and there were no such problems.