I got about 150-170 pound of live rock. I really don't think you need anymore than that. It all depends on what you want to keep. Nowadays it seem less is more if you know what I mean. On my tank I do keep a very good water change schedule since day one, 5-10% every week. I can only count a hand full of time where I lefted it for 10 days. Also I have a heavy duty skimmer to export any or all excess nutrients.
I have a heavily stocked sps tank with 6 large tangs and 14-16 small-medium size fish and I never have any problem with my ammonia or nitrite. I started to run bio-pellets after 6 month into the setup and that took care of nirate and phosphate, but after a while the phosphate crept back up a bit, so now I am running rowaphos in conjunction with bio-pellet.
I don't dissagree with a pound of LR for every gallon of water. I think its just a generalization. It all boils down to your bioload and what kind of coral you would like to keep. Do you mind taking a picture of your setup and share it with us, i would love to check it out.