First question from above....I don't experience any sweating with the new pads, but that may change once the weather becomes hot and humid again here in Atlanta. There is more interior room inside this pad which I suspect will give yours ears more breathing room. The pads certainly seem to breathe well to me. In comparison I can put on my htf600 and in less than five minutes my ears will be sweaty.
Question 2...the only change to the mod that I'm aware of is the removal of the white foam tape.