Tail rotor drift happens if you keep the wings/rotor disc level - it is producing thrust laterally - therefore you have to tilt the rotor so that some of the MR thrust is directed laterally in the opposite direction.
That sorts out the drift - the roll attitude is the result of the forces balancing - the TR thrust and horizontal component of MR thrust create a rolling couple and the vertical component of MR thrust and the mass of the aircraft create an opposing couple.
DB - no, it was your crappy hovering
