Do you do this ungrouped or grouped? If ungrouped, you can't just do 1 point of damage to get the kill. You need to do at least 50% or you won't get near the full xp for the mob.

I find that using a lvl 70 to instance grind 1-42 is definitely the way to go... and after that, I still instance grind with the 70 because the XP is better than anything that I can quest with... PLUS, my 5 box group will eventually include that lvl 70, so it makes sense. I'm at lvl 55, and I do admit that things have gotten a lot slower. I had a lvl 70 warrior friend bring my group through Strat and we didn't have tooooo many problems, so I think I'll bring my own warrior in there and do it myself.