Chardok is a way better bet than all of those velious suggestions. General rule of thumb is that velious mobs have more hp than kunark and old world counterparts. You ideally want to find the most concentrated amount of low hp blue mobs to blow through in a given cycle / hour. This is why zones like the hole are so great. KC as you know is way overcamped so you will get probably 1/10th the exp and mobs.
Plane of Mischief will be a great place to go eventually. Once you are there you won't want to change your bind though. A CoTH generally runs 4k a person these days, maybe you can get a nice mage to hook you up with a 2 for 1 special or something.
You really won't make money there until both of you are 60 and can duo the puppets. They double for 400's but rarely can drop the thrones for the upper tier item combinations. These thrones sell for up to 40k a piece and it is probably one of the most lucrative camps in the game for a duo.
It's also a great place to be bound because it has a zone out to Cobalt Scar so you can bank in SS or quickly run to ToV or Kael for raids. There are also recharge merchants in the rat maze below so it is very convenient for my monk.
Speaking of the rat maze, there are a ton of wandering 40ish level rats in the basement with low hp. They do social agro but their radius is pretty small and there are many safe cubbies to pull them to. I easily solo'd the rats on both my Monk and Necro. I've very rarely seen people exp there as I don't think PoM has a great exp modifier, Chardok is probably still quite a bit better, but if you are looking for something different that is an option. They also rarely drop the knights that sell for about 1k a piece so you can still make a little coin there.
If you do go to PoM you probably won't ever want to change your bind spot, so you really won't be able to exp anywhere else, so it's a commitment for sure =)
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