I agree that you have described a nuance that could be meaningful if we knew more details.Well at first look, they sound the same but if we have a closer look (over-analyze?), doesn't the first stress on designed and the second on "for your vineyard"?
A method specifically designed for your vineyard. (The stress is on the underlined part)
A method designed specifically for your vineyard, ( not for anyone else's vineyard).
But that maybe a case of intonation rather than the word order, or I may have been simply over-analyizing it.
I agree with JS's reaction to EMP's comment. It would be helpful, Fab, if you could give us a complete sentence and a bit of context instead of just a fragment.I agree that you have described a nuance that could be meaningful if we knew more details.