Go to Trinity Settings > Variables, and then find Monk.MantraOfHealing.UseHealthPct.
Set that to whatever health percentage you want MoH to be used at. I have mine set to 0.85.
I just upgraded to the latest demonbudy (v1.0.1560.323), and the plugin is no longer working. I am seeing the following in the log:
[15:15:59.821 D] Exception while pulsing plugin GearScore: System.Exception: Only part of a ReadProcessMemory or WriteProcessMemory request was completed, at addr...