The first thing comes to mind is the truss rod adjustment. If you adjusted the rod clockwise it will hump up toward the strings more and actually make the buzz worse. If you adjusted the rod counter clockwise it will relax the fretboard and neck more and should lessen the buzz, however, guitars off the shelf nowdays the frets are usually not very well dressed down evenly across the tops from fret to fret and not true in alignment. This is only one of many problems that come from purchasing off the shelf guitars.

Custom handmade instruments come with the most true and accurate playability possible, at least mine do. It takes a lot of work and care to achieve the final fine adjustments and fret dressing needed to play properly. If one does not have experience in this he can make matters even worse. It is time consuming and very careful work by one who knows what he is doing in the geometry of the guitar neck. This usually is not all that expensive when taken to a professional who can do it right. I suggest you do that so it will come out worth while for you and if you get a chance you may want to hang around and watch what he does. You can also purchase books on the art of fret work from most luthier suppliers catalogs. Try Luthiers Mercantile on line.