Yeah I don't remember Monk but this was back in 2.0, I am very confident this is how it went, can correct me. I take that back about the losing combo part, only 2 things really did it.
Heavy Thrust (Flank): 15% damage buff plus Potency+ if you flank and you only obtained the buff when flanking.
Chaos Thrust (Rear): Dot plus Potency, you only landed the dot if you used at the rear.