Digital BW, The Print

i'm getting ugly bands of color -- greenish and magenta -- in my black and white prints 
(epson 2200, enhanced matte, standard inks). i'd appreciate any advice on how to fix this.

i'm converting to B&W with fred miranda's BW Pro, then i'm quadtoning with my own 
variant of some quadtone presets i've found. i'm using epson's paper-specific profiles -- 
the latest ones.

the effect is only noticeable in areas of fairly even grey; the tone changes seem to be
accompanied by these ugly color changes. for example, in a portrait the area in which the 
hair meets the face has a greenish halo around it. in many of my photos, the effect isn't 
noticeable at all, presumably because the contrast is higher, and because there aren't 
areas of fine gradations in grey.

any idea what's going on?

at first i thought it was my quadtones, but i get the same problem (albeit to slightly lesser 
degree) even with a pure grayscale print.

i'm considering buying custom profiles. would that solve my problem? any experience out 
there with:
	cathy's profiles
	dry creek
	christophe metairie?
	
and some other related questions:

-- i'm adjusting levels AFTER conversion to B&W and toning, because otherwise the toning 
can mess it up. is that a bad thing to do? could it skew the colors? i've tried doing it the 
other way (levels first), but i still get the color band problems.

-- are the profiles for epson paper made by dry creek ($175) -- not custom ones -- really 
any better than epson's?

-- i haven't managed to find any really good quadtone presets, although i've made some 
progress tweaking ones i've found on the web. what often is described as a 'selenium 
toning' preset produces a print that's almost sepia -- makes me wonder whether the 
people who create these have ever really seen a selenium print. any idea where to find 
good presets?

-- could my color space settings be affecting this? my understanding is that if i use the 
wrong color spaces in photoshop, i'll just get reduced gamut in the worst case, not 
problems like these color bands.

/daniel