The pool of experienced A321 F/O's wanting the 330 was exhausted (lots got commands) and a couple of new joiners this year are going straight onto it (they had worked for us before under CTC). There is currently a bit of an experience vacuum until last years ex-CTC cadets get their hours up so if you're rated on it already I would have thought you'd be in with a very good chance of being put on it almost straight away at present, assuming a vacancy on the fleet. It's only a matter of time before the ex-CTC pilots get enough hours to be considered for it though (not sure what this limit will be).