Digital BW, The Print

Hi All:

I have run across a perplexing problem while printing B&W with my 
Epson R2400 printer.  I am using Clayton Jones' recommended settings 
(Paper Type : Velvet FIne Art; Quality:Best Photo; Print Option : 
High Speed; COlor Management: Advanced B&W; Ink Config: -5% Color 
Density; TOne: Light; Printer Profile: No Color Management; Image 
Profile: Dot Gain 20%; 16 bit Greyscale; 720 dpi; Print COlor: 
Neutral).  I ran a test print of a 21 step steptablet and wanted to 
further reduce the ink loading.  I reduced the Ink Configuration to -
10% from -5 % and there was no observed change in ink density on a 
testprint.  I then tried -15%, - 25%, and all the way down to - 50% 
on the color density slider with the same results - no observable 
reduction in ink density!  Minus 50&% is all the lower the slider 
goes.

I contacted Epson tech support and their reply was "The effect is 
very slight and can be hard to see.  Try adjusting it down even 
further, or adjust in PhotoShop to reduce the amount of 
saturation/black levels."  So much for tech support!

Has anyone out there ran into this problem - the non-working color 
density slider under Ink Configuration in the Epson printer driver  
with Print with Preview out of PS CS2 using a R2400?

Thanks in advance,

TK Thompson