i slaughter cyclops from lvl 60-120 with blade....new chars i kill a few things near town, skip SM and go to Darkon till lvl 60ish. then Azria...
you can remove SM for all i care, keep the cave.
Flaris has a few good things, but most can die.
in Darkon, pick a mob every like 10-20 levels and remove the rest. go from like steamers, carriers, mushies....i stop there but you may wanna keep a few others.
Azria, there are alot of scattered mobs that can be removed.....i say leave the main mobs that are closest to the entrance then remove the rest.
Volcan is fine.