Digital BW, The Print

I've been printing trouble-free until recently. My setup is a 2200
using QTR with MIS PKN and MIS Pro Light black and the other MIS Pro
inks. I've recently noticed some microbanding in the midtones. I've
tried all the different dithers, reinstalling QTR, and changing print
size. Nothing seems to work. The Eventone dither at 2880 works best,
but there is still some microbanding. Any help would be greatly
appreciated.

Chris Hargens