Big Mick
"2014 - Kunce of the year"
High bar which is usually the common bar position for anyone but powerlifters in on the traps.
Well I must have been doing it wrong for the last 25 years, well so far so good, nil problems so far.
The tarps attach all the way up in the base of the skull and run half way down the spine and insert into the shoulder, the op's issues could be a result of many things, the bar sitting on the tarps, could be irritation from some other refferred issue.
I did not realise the whole thing is the traps, I always though was just the bid you see sticking up above your shoulders going to your neck.
Anyway would still be looking at the simple things first before attempting major reconstructive surgery, so bar position and squat form would be the first thing to look at, if that checks out go from there. Might even be presses and dead lifts that irritates the issue (or other exercises he might be doing) and it just shows up, or is interpreted as being caused by the squat bar.
Personally I find no problems from the bar, and have never used pads or anything, may be try a pussie pad and see if it helps.
Could be any number of issues, but again I would start looking at the simple things first up.