I get the same thing when i up image quality on my Nvidia card.
The text get almost unreadable.
When I don't use Anti-alising and astrtopic filters the text looks better.
When i set my card to best performance the text looks great Planes look terrible. and vice versa best image quality the text looks bad and planes look great. hmmmm. I'm hoping thats what your talking about and not the brighter image. For that i would just up gamma and moniter brightness.