QTR-Quadtone RIP

In the 'Why are Epson 2200 prints too dark' thread Roy stated:

>It really just boils down to: edit in grayscale with your favorite
method then apply i.e. convert to the best print profile you have before
printing. The best is either the generic QTR Matte/Photo Paper profile
or your own custom profile.<

>This is just like any color printing that you do. The only thing
different is that you are not printing directly from PS Print with
Preview where you can select the print profile on the fly. With QTR you
need to Convert-To-Profile and save the tiff file.  With other
editing/printing programs the exact steps may be different but it's
always the same idea.<

What does it boil down to for Window users who print through QTRgui?

I edit my images with softproof turned on using the profiles I've
created using QTR-Create-ICC-RGB and my calibrated monitor. I save the
final as a tiff and print through QTRgui applying the .QUAD file used to
create the softproof profile. I don't convert or tag my grayscale images
with any profile. I edit with Picture Window Pro.  I suppose I could
alternately convert my images with the .icc profile and print through
the Epson driver with CM turned off.

I get good matches between monitor and print (as good as I think can be
expected between luminious monitor pixels and reflected light from the
prints). Have I been lucky or am I just not discerning? Am I missing
something?