Difficult call. A lot of people report they've gotten them back from Epson still messed up, sometimes differently or worse, but it's free. DAG charges for it but he'll do it right. Personally I'd get familiar with doing it myself because from reports it happens even after it's been adjusted by no matter who.
BTW was yours spot-on when you got it a week ago and has since gone out of whack or has it been out of whack all along?