Well... still using them and as you mentioned, pads definitely changed their sound.
Highs are DEFINITELY harsher with these pads on.
The original but uncomfortable pads definitely sounded better to my ears.
I might try others if I find them at home. Should have some "cheapos" somewhere.
Also, if you are in the States, I can just send them to you so you can compare them with your current JVC cans.