As far as I've had it for the relatively short time so far (around a month), I don't really notice the date wheel shifting around; even giving it a few shakes or nudging it with the quickset date.
I do notice however, that the date wheel sits relative "deep" into the dial - i.e. with the raised date border inset and the actual date wheel sunk it it appears to be "misaligned" at different angles unless you are looking at it straight on.
Unfortunately I don't think I can give an educated advice beyond that. Does the date wheel shift about even if you leave the watch sitting still on say, a table? Or only after moving it around on your wrist?
Regards,
skyeriding