I have been traing in the LRCs, killing Living Rock Protectors and Strikers. They give about 1200xp per kill and don't hit hard.
I'm 70 att, str, def and hp. My def bonus on my armor setup is approx 310-320. I use super att and super str pots and monkfish for food. 80k to 100k xp an hour.
They drop decent stuff, mainly noted ore. My drops pretty much pay for food and pots.