Digital BW, The Print

Hello,
I've been getting an erratic overspray of ink on the edge of my
prints 
(and within sometimes). I'm using an Epson 1280 with MIS UT2 inks and 
spongeless carts. To help clean the nozzles I soaked some sheets in 
99% isopropyl alcohol and printed some purge patterns, this helped
for 
about two prints and now the overspray is back. I thought it was 
isolated to my 1280 but I just made a color print on my 2200 and 
noticed some overspray too. Does anyone have any experience with this 
troubling problem I searched the archives without any luck.
Thanks,
Jim