Well, I've read almost every thread on avs forums about grey screens. And obviously have not found a sufficient answer yet. So there's no need to be rude.
As for more info, I can certainly give it:
I'm going to be using blackout cloth with my lcd pj, 1000 lumens, 400:1 contrast. The room is not completely blacked out, and there is always a degree of ambient light. I obviously would like the best blacks and whites I can achieve without sacrificing too much color and punch in between. Also I'd like to keep the gain low to increase the off axis viewing. I'm debating the paint between a mixture of Behr Ultra pure white matte and Grey Tropics, or Artists Gesso white and grey.
Is that enough info to decide a correct white/grey ratio? I realize that it also takes alot of experimenting and evaluation. But I guess what I'm asking is, what do I look for when determining the best ratio? How will I know when it reaches the perfect spot? And what ratio is a good place to start?