I've had my m80's at that level several times and noticed the same, being that it wasn't irritating. When I had my m3's at the same level in the same room, it was a different situation. Not sure if that is how you see, or should I say, hear it. I think the m80's would impress you but your PSB's seem to be holding their own.

M80's(2), VP150, QS8's(2), M3's(4)