Judging solely by his stats, I'd say this isn't a mechanics fix like Guerra was... it's more of a "finding a consistent release point" kind of thing, which comes with repetition. I don't think Meyer is nearly the project as some seem to think, and judging by the numbers, I'd say he has gotten a bit closer each year.
I would be careful making any judgements using stats. He was a college pitcher with an upper 90's fastball playing in A ball. he could have been missing his spots by a mile but still getting swings because he was flat out better than the competition. It wouldn't surprise me if the walks rose quite a bit as he moves up in the minors.
FWIW - I like Meyer more everyday and I'm going to try not to get carried away but I also can't wait to see what he does in AA and hopefully AAA this season.