Hi guys. Quick question. I recently restrung my bass, an Aria SB II, and replaced with a heavier string gauge. Did a very rudimentary setup, intonation and truss rod adjustment, and I now have a buzz at the first 5 frets on the E. Took some tension off the truss rod, readjusted action, same deal. Is it possible the strings I stepped up to are just too heavy a gauge? Or maybe the noise is due to the string not sitting in the brass nut properly? Overall I can't get the action back to where it was. Higher overall regardless of whether I flatten the neck out or leave a slight down bow in there. As simple as going back to the original gauge string? Any help would be greatly appreciated. Thanks.