Took this spawn on as last part of the Hunter Quest for a guild Hunter Raid. Most of the mobs in this zone were rare but this one took nearly 48 hours during one of those "increased probability of spawns" phases.
Whether right or wrong, I found a spot at /waypoint -572, 1057, -122 which appears to be near several tracks and/or spawn points. At times I had 5 or 6 mind burrower corpses splayed around me like a flower, but I got the Thought Stealer in the end. Corpse was NE of me at this location so maybe that's where it came from.
Hate this zone, always did especially way back when this zone actually meant anything. And to make matters worse, lucid shards were dropping like confetti.