Digital BW, The Print

Please note: I also posted this on the Epson 4000 Forum, but have not 
had any responses (it's a little quiet over there).  So I apologize 
in advance for the cross posting.

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This is really a color question, not B/W, but this group is diverse 
and there is a lot of expertise here.  

I am curious if anybody has used the Epson K3 inks or the MIS 
equivalent (for the 3800 or 4800) in a 4000?

Of course, the LLK ink could not be used, since the 4000 driver 
doesn't recognize a 2nd light black ink, but the ink formulations in 
the K3's are different and I'd expect they are probably wider gamut. 
(I know I would need new custom profiles).

If you have used them....

Was it an improvement?

What about Dmax and overall color gamut?

More or less clogging?

Other thoughts?

Thanks, Lou Dina