Digital BW, The Print

I have good profiles for printing on Satine Bright White using MIS 
Perpetual Color and am well satisfied with that on an Epson 1200. On 
the other hand I have been less than successful in finding a good 
setting for printing on Satine using the Piezo plug in and an Epson 
860. The best black I can get with a reasonable curve is about 1.55. 
If I push the dot density to put down more ink I can get the black 
to about 1.72 but then the curve goes to hell and runs in blocks 
rather than individual steps.

No problems with Museo and PhotoRag. PhotoRag seems to produce the 
best black value, 1.78, and still has a good curve. Museo is more or 
less between.

To cut to the chase, what luck have you had with satine and piezo?

Thanks,

Roger