Digital BW, The Print

As you may know I've been refilling 2100 cartridges with MIS Ultratones
for a while now and more recently also their 7600 archival color inks.
When I just used the Ultratones I got mottling in shadow areas of my
prints on glossy papers, and I thought this was due to some interaction
between the light black and the dark cyan, and the fact that the inkset
hasn't been tested for this printer.

However, now I get the exact same problem with their 7600 archival color
inkset, and they claim this should be compatible with the 2100 and also
work great on glossy papers. Since I get the same problem with both
inksets I'm beginning to suspect that the problem might not be with the
inks themselves, but with my refilling process.

I'm using the vacuum refill methos as described on this page:
http://www.anestoday.com/epson2200/replete2.htm

Can the fact that I'm rinsing old cartridges with water be the problem?
Could there be residual water in the cartridges that's mixing with the
inks and somehow causing these problems? In that case, shouldn't the
problem have gone away already with my Ultratone cartridges as they've
been refilled twice after rinsing already? I'm careful to blow air
through the cartridge after rinsing to clear out any leftover water.

I think the problem I've mentioned with roller marks on glossy papers
can be partly because of this. 

I get consistently prefect nozzle checks and good prints on matte
papers.

Any suggestions on what I might be doing wrong?

--
Daniel Staver
http://daniel.staver.no