Digital BW, The Print

Hi,
 I am running the Ultra's in my 1280 and was not getting very good 
transitions in my prints with Paul's curves(1280's and 1290's) After 
Paul's post about using the driver sliders for tone adjustment in his 
new inkset I figured I'd try it with the Ultratones. I have printed a 
multistep wedge and four seperate images. They all look good from 
about a medium warm tone to a neutral cool tone. Not much more 
adjustment in the sliders to go either way. Settings were as follows.
Medium warm: Magenta -10
Neutral : Cyan -10
Neutral Cool: Cyan -20 Magenta + 20
Images printed from greyscale and all other setting as per Paul's 
Ultratone workflow
 Does this sound right? Has this all been gone through before?
Thanks,
John
PS: Thanks to all who share their knowledge....I have learned alot 
following your posts.