Centering of all OpLevs has been nominally good. That being said any slight misalignments may be being exacerbated by alignment loops/drive during long lock stretches (this particular one is approx 18 hrs). The optimal time to center, after a short discussion with Jenne, would be at DC readout after the soft loops are converged (about 30 or 45 minutes). Otherwise, cold IFO and Aligned optics are the way.