sparktite: You should be getting around 10k exp a round. You have to :
A.) Do it on the appropriate difficulty for your level
B.) Wear EXP Per Monster gear for best results
The rounds take about 10 seconds to complete, Kulle takes about a minute twenty.
Alternatively if you just want to feel like a god throw on the best exp gear you can buy (may be a little costly?) go to normal mode and just poop on EVERYTHING

Go with 3 people for more mobs. The exp gear will give you exp for them. So if you have +500 exp gear (example) you'll get 500 exp per mob
