What is the decor in the tank like? Are there things (plants,
driftwood, etc.) that can help break line-of-sight and set territory boundaries? My bolivians seem to stop chasing each other as soon as the aggressor loses sight of the intruder.
I'm not sure if it's a case of their territory being "safe" if they can't see any intruders, or if their territory is only limited to what they can see at a given moment, but giving the less-dominant fish some plants to dive into or rocks/wood to hide behind
may help.