I have an Essex P style bass that has either a nut, or set up issue. The bass played okay out of the box except the open A and D both buzzed. From what I can tell, the strings buzz against the first and maybe the second frets. There was hardly any clearance in the first few frets and bridge adjustments made no difference. I have not had a pro set up done on the bass. I put a small piece of paper behind both the A and D strings and now it actually plays quite nicely. Would a good set up / truss rod adjustment help with this or does it sound like the problem is with the nut?