I just got a 20th anniversary Fretless Sting Ray. I adjusted the truss rod and the height of the bridge and it feels and sounds very good in almost all of the strings and notes except for the C note in the A string (third freet position) where I get a really bad buzz, the curious thing is that in the same string in a lower or higher notes I do not get the buzz. Also, when I play a C note on the E string (8th fret position) I get also a buzz, it is not as bad as the one in the A string but it is still there. I do not know If I did a bad job at adjusting this and I am looking for a step by Step instructions on how to adjust the truss rod and height to see If I get the problem solved. Any suggestions?