What would be interesting is to know exactly why the flick roll to the right occurs.
Normally a yaw to the left would produce a roll to the left as a secondary effect.
The only explanation I can offer is that the TR is above the vertical centre of gravity in a robbie - most of the weight (engine, fuel, pax) is below the line of the tail boom/TR.
So, when the TR is pushing to the right (to create left yaw) it is pushing the fuselage in a roll to the right about the vertical C of G. With no cyclic control (very low G) to oppose that movement, the fuselage can only go one way.
This may be worse in the cruise since the TR is even higher due to the nose down and lack of horizontal stabiliser.
Thoughts?