Have you considered dithering schemes other than UV22HR? For all the hype it gets, I didn't like it as much as a couple/few others in my comp:
ftp: tapers.org
dir: /drive1/gear_comparisons/dither
l: ftp4all
p: ftp4all
FYI, I don't use the highest noise shaping settings on the two other dithers I prefer, even though that's what I used in the comp.