Gary
You did not tell us what the density ranges of the negs you were using so
it is difficult to comment.
With pure platinum one should be able to get a good print from a neg with a
range of about 1.9. Adding progressively more palladium gives prints with
good gradation and good detail in the highlights and the shadows with
negatives up to a range of about 2.2 to 2.4.
I would prefer not to print Pt or Pt/Pd with negs below these
densities..
Terry