Ged,
I agree with Kirthen it may be hard to nail this down until you have a known good quality reference point.
If you do have a DVD feed available it would be worth getting hold of a copy of DVD Essentials, Avia or similar
Or at least a disk containing the THX optimode set-up utility (Episode 1, fight club both have this, possibly others) that will let you get your user settings into the right ball park.
I certainly noticed an immense improvement in image quality having run through the set-up routines in DVD Essentials.
Although it took a day or two to get used to the new look, the preset look overly bright and garish now,
As reference my settings are:
Contrast 24
Brightness 46
Colour 56
Tint 0
Sharpness -30
Although I suspect that the exact setting will not produce the same results from set to set.
It may also be worth trying your own settings based on the different presets.
From other posts I’ve read it appears that different features are enabled / disabled outside of user control depending on which preset was selected when making your personal settings.
I have mine based on preset –3 which I believe disables scan velocity modulation.