Digital BW, The Print

I've just started testin QTR with mixed results.  I just made four
prints on lustre paper using the lustre profiles.  No matter whether I
used cool or warm, and any mix of settings on the curves, every print
looked the same - a fairly pronounced warm tone.  Color prints with
the Epson driver work fine, so there's no issue with the ink flow.  Ideas?

Also, I'm not sure I understand why there are two curve settings and
what they control and how to get a neutral print out of them.