Dixactol & Aristo Head?

I used Dixactol with Ilford Pan F film recently for the first time and became frustrated with the extremely long printing times. I use an Omega D5 with the Aristo Variable Contrast head. I used it both in the split contrast mode and selected filtration mode. In neither mode was I able to get properly exposed prints. Times were extended to 3 minutes at f5.6 and still more exposure was needed. The negatives were stained using Dixactol's single bath procedures. The stains were dark but the negatives appear to be properly exposed. Is the problem Pan F? I am really puzzled over this one. I am accustomed to long print times of 1+ minutes in the split contrast mode but nothing this long. I would appreciate your comments.

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