I got a video amp with my ArcadeVGA, and I have to say what a difference! (My monitor, a 25" WG 25K5515, doesn't have the ability to be adjusted to work well with VGA level signals, I think because it doesn't have three "drive" pots, but rather only two...)
The brightness is much much better with the amp. However...I seem to have too much "contrast", where the bright areas are bright but the dark areas are too dark. I tried playing with the black level, screen, drive, cut-offs, etc, and made some improvement, but I'm not satisfied.
Any other ideas I can try?