Personally I've found Halls of Lightning to be more efficient as a non healing class, playing a sub rogue, only real healing I have, is recuperate, which requires combopoints, which is per definition not possible on these mobs, getting a max of 2 pts, and spending energy on recup all the time, just slows it down alot, and even at that, I'm slowly dying to the aoe shit they do.
Halls of Lightning on the other hand, offers mobs with no real damage, (ie the stacking debuff given in TotT isn't there, obviously), and recup can easily keep me alive. I don't even bother moving in HoL, i've found standing near the forge in the middle, with the entrance to my back, offers a respawn time on 1-2 seconds, and continues to do so.
I have no idea how long the bot has been running, but I'm currently at 600 lovely charms, and 110 love tokens, and soon to be the first owner of a Swift Lovebird on my realm.
EDIT: Using the TotT, what's your kills/hr on?