UIM (level-3) 1t Karambwans pre-99 325k XP/HR (30 minute sample) 

90-92 I gained about 225K/HR, but at 92 it bumped up to 300K/HR.
Now that I'm 94 it's roughly 325K/HR based on this 30 minute sample.
The only requirement is Tai Bwo Wannai Trio quest complete & Coins.
Shout out to Rezs for supporting me with the method.
Shout out to Alice for filling me in on it's affordability & doing it to 99.
Shout out to iRelent for sharing this song, which I'm now addicted to.
RL plugins used that are helpful:
World cycle with it's keybind near escape key.
StopMiscklickingTiles set to the tile of the fire so you don't accidentally walk on it.
Also, shift click change to one click buy all raw karambwans, and alt for not trading Tiadeche.
Custom Menu Swaps:
Take, ashes
Take, Cooked karambwan
Take, Burnt karambwan
Use, Raw karambwan (arrow angle brackets yt doesn't allow) npcName