Digital BW, The Print

I use HPR for all my work, including B/W.  I print on the 7600 with UC 
inks and QTR.

I am noticing a few tiny bits of flaking,pin point size, even after 
spraying with Print Shield.  I spot the darkest areas with black 
pastels before spraying, but there is no way I can deal with flaking in 
the mid tones.  I have even tried using a draftsman's horsehair brush, 
but still see problems.  Am I being too picky? 

This is making me crazy.