sagu...what glide wrapper are you using? did you try all of the options enabled at first? (like anti-aliasing, mipmapping, etc.)
me thinks that maybe by disabling all those options would make the game look a lot worse. instead of transparentcy, it would reflect. instead of a smoothed out rotor, it would be solid, etc.
if you haven't already, try setting all your glide wrapper settings to AV8R's settings (in the post with the DGVoodoo pic...about 12 above) and see what that does