I haven't read every page of this post, so I don't know if it's listed in a reply somewhere, but I didn't see it in the original guide.
I have used Oldton Movopolis (J-10) to solo both Rdm & Blm in the mid 30s. I was there last night on Blm from level 35-37 (stayed for a buffer for 37). When I arrived, the Goblin's pet Bat were all T. At 37, it's possible you would start getting some EM mixed in, and it would be time to move on. But you could most likely start here earlier than 35 as well.
At 35+ I could 3 hit the bats with Aero2, Stone2 or Thunder, and Water2 (probably overkill by then, but did it anyway).
There are 2 goblins here, a Tollman (with pet), and a Shovelman. They follow a radius path. The platform side is a good place to camp (best in my opinion), and you don't have to move much when pulling or killing the bat. However, the gobs sometimes wander close by, so you'll need invis ready (or always on between pulls to be absolutely sure). If you pass the gobs to the other side, there is a tunnel mouth there. If you stay right on the inside edge of the tunnel, you will be out of the gobs natural aggro range. However, you have to watch for bats behind you, and you will also have to run a little bit when pulling.
This camp requires patience! I can't stress that enough. There are times when you may feel like you are waiting forever for the next pull. However, in my time last night, I also hit chain 4 on several occasions. I averaged about 4k/hour xp here over 2 hours, with 1 charge used of an Emperor Band at the start.
Also, a warning to others. I first headed to the Zi'Tah camp, as the OP was under my control, and would give me some added pluses for being right there at camp, like free HP, or not even changing my HP, as I could cheaply just hit the OP warp again. I arrived, and there was a level 30 party there, camping the pets for XP.
As much as I have loved this guide, it has become so commonplace for everyone, and people realize how good the xp is for easy kills, they have started to use these camps for ALL xp now, even parties. Your solo camps are not safe.