1) I became ExpiredReign's unofficial spokesman on this topic, so I will say it on his behalf: The Communitas map should be using the default in-game resource distribution function, so it should not be generating the excessive amounts anymore (it was change several months ago, maybe it's been a year already)
2) There were several good threads about the best maps and their settings - try googling them. One group of people (me included) liked Tectonic (without "s" at the end) and PlanetSimulator, another liked Communitas, then there were smaller (but vocal) groups supporting Continents and their dedicated and Oval/pangea.