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I wouldn't argue that he'd go up further than this (I think this is close to his ceiling).
If he maintains his skill gains though, he can repeat. Even a slight fallback from his '09 FB% and he'll still be a slightly better version over his career numbers.
He was extremely unlucky in '09 and changed his approach at the plate. In Safeco with a sligtly lower FB% I'd bet on a 840-50ish OPS (that number would go up if you steal some ABs vs elite lefties).