I tend to agree with highhorse. Torque rolling is due to the reaction to the amount of power you are having to use to support the model. Switching to a prop that lets you use less power to maintain the hover will help. Adding more aileron throw would also help. Especially if you are using a reduced travel on the ailerons until you get a feel for this style of flying. But adding right thrust for example will NOT reduce the torque roll effect and would add in some yawing force during your hovering attemps. A lighter model would also torque roll less because it needs less power to hold it up. A lower pitch prop would help because it gets a better bite.

Now there's also the drag produced by the prop as it performs it's lifting duties. When operating in a static thrust mode as we have on the ground or in a motionless hover if the pitch of the blade is high enough the blades will stall. They still produce the lift needed to hold the model up but the stalled condition of the blades requires a lot more power from the engine to maintain the RPM needed to produce the lift. Switching to a prop that doesn't stall under this static condition will greatly reduce the power level needed to maintain the hover RPM's. This could be from a prop with a more stall resistant airfoil or it is usually done using a lower pitch prop so the blade's angle of attack is less.