*Excellent* advice. (One other tip: start the main mix from the vocals down, not the drums up.)
Again, *excellent* point.
One of the biggest problems all soundmen face (and too few know about) is the principle of reverberant zones. Briefly put, a room or a space acts like a reverb spring: beyond a certain threshold, the more energy you pump into the zone, the more it reverberates and the mushier the sound gets. Therefore turning up makes the problem worse; but turning down can help dramatically.
As a musician, nowadays I insist on a fairly quiet stage level - I use a pair of 20W or 30W combos, and if I'm drowned out, the band's too loud. I find that the better the drummer, the quieter he's capable of playing - and my current drummer is world-class. I almost don't need monitors, but I do use them where necessary - and I simply don't have problems with them.
By the way, this does not mean we don't kick ass - we do

. But as both a soundman and a player, I've learned to *despise*, with a passion, overly-loud bands. Apart from anything else, I value my hearing *and* that of my audience.
HTH,
Steve
http://www.fivetrees.com