Hi TimMe too. I still haven't managed to get ANY FE series lens that was right first time, and I have them all...
Just checked out your 'low-grade decentering' and have to say that I would more than agree with you in fact I would call it 'pretty bad' and a lot worse than what I saw on my first copy of the 24-70.
Bt the way is there anyone in particular you deal with at Park cameras. I have been in to the London store a couple of times but wasn't totally convinced by the staff's knowledge. If I did by the lens from them it would be a great help to know I wouldn't have a problem if I needed to change it