I have done 3 different dilution test atm. It seems that diluting the developer and Blix helps. for the developer I was using at first the recommended dilution (recommended for 38c/45s) 1L=640ml water, 300 ml replenischer and 60 ml starter.
Maybe its not a good combination of paper/developer.
Here In Germany the AGFA stocks are still circulating. Maybe I should get some FUJI/KODAK paper.