Finally found a mod to increase the comfort of those S500
Warning, once done can't be undone!
Right side, remove two screws
with cutter remove 1mm from part shown (top arrow), right arrow shows 1mm piece cut off
Do the left side and you are done....
10 minutes mod.
I can finally wear the S500 for more than 15 minutes without my ears burning. Your milage may vary.
btw...these pads are ebay HD25 pads replacements, not originals.