Digital BW, The Print

Help! My Epson 2200 has started printing soft prints. They have much more grain, and they 
seem to have grey halos that give the whole print a slightly out-of-focus look. The effect is 
only noticeable if you look close: 3 ft away, I can't tell, but 1 ft away I can see easily. 

The most bizarre thing is that the problem seems to mostly go away when I print at 2880 
rather than 1440. This is very odd, because I've never noticed an improvement before at the 
higher resolution, and the halos are big -- perhaps 0.25mm. The high speed toggle makes 
no difference.

Has anyone experienced this before?

I'm using UT7 inks with Roark's curves on Mac OS X. Things I did recently: I got banding ine 
of the colors, so I ran a cartridge of MIS cleaning fluid through it. I also switched to filling my 
own cartridges using MIS's kit. I installed QTR experimentally, and removed and reinstalled 
the Epson drivers. Nozzle checks and purge prints come out fine. I've realigned the print 
heads and filled ink cartridges that were low.

Any suggestions would be very welcome.

--Daniel