You have two opposing Moments.
The first is the T/R thrust, acting to the right and lower than the rotor head, and the other half of the moment is the horizontal component of the main rotor thrust, which has been set at an angle to oppose the drift effect. This first moment tries to roll the aircraft to the left.
Opposing that, once the aircraft rolls a little bit, is the CG, which is no longer in line with the vertical component of the rotor thrust. It acts straight down, and is off set to the right from the main rotor thrust, acting straight up. This moment tries to roll the aircraft right.
The two moments fight a little, the more the T/R moment tries to roll to the left, the more the CG moment is offset and opposes that roll.
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