Might've found the next grinding spot for quite a few levels. Undead Warriors, level 52, 2000 health, 2335 base EXP. At level 44, In this server, they give me 4670 EXP (likely suffering from a penalty due to level difference). They aggro and hurt a lot, but they're melee and there don't seem to be many other monsters mixed in.

They're found at 530, 1810 in Ascaron, Chaldea Tundra. That's far, far to the north-west of Argent Town, but you can go to the mines and, through a chain of teleports, reach the Chaldea area, so it's a very reasonable walk.