hi Raus
i have no technical help for you, i'm afraid.
but i got an acer 19 inch flat screen for christmas. i expected miracles for sh3 + gwx. but to no avail. everything stretched and bleached out.
it has taken a couple of months of tinkering with my nvidia 7900 gt graphics card and the built in adjustments in the monitor - trying to balance the two - finding a happy medium.
and its turned out well. the game looks good, but it took some doing.
i updated my g/card which helped, read the manual for the monitor, tinkered with the card which drove me crazy
dont give up
i hope this offers, at least, some understanding of your situation.