First off I've setup dozens of basses and most not Fender so I'm not a beginner but not a pro luthier by any means. However, I have a really killer sounding Squier PBASS Special and can't for the life of me get it to not fret buzz (mainly above the 10th-11th fret area). I have set the relief within spec and had to raise action almost all the way up with is double that of most basses. I tried less and more relief as well as shimmed the upper pocket to try and kick the neck out a bit. The shimming helped a little bit but not sure if I should shim a bunch for this issue. Any ideas? I've never experience a bad fret job but wondering if this could be the case. What is a normal fret leveling cost?