Thanks for the info Markos, checked out ZZmedical, and the prices are close to CXS. 2-8 minute exposures does give me pause. What light source are you using and what enlarger? I have a Beseler 45 with a 45s color head. If I can remember I was getting exposures of about 90sec with a 135 lens and wide open at f:5.6 with a 4x5 negative and 8x10 image size.
bvy... I had never heard of contact printing a print with litho film, but it sounds like it could work. Do you try to control the contrast of the film negative by adjusting the contrast of your paper print? I would think if you had a very flat low contrast print you might be better able to control the contrast of the film negative.
Thanks all for the great information!