Hm. Even more recessed mids doesn't sound promising. Thanks for sharing, though, and please keep us updated if your impressions evolve with time/pad break-in.
Another curiosity of mine: Is there any way the M-100/XL combo will fit in the original hard case...or is that a no-go?
To me they sound just a tiny bit more recessed, but like it said it may just be from the change in soundstage.
It does fit, but folding the M-100 with the XL pads on feels strange, the pads press against each other pretty hard and compress a tiny bit. If you wanna carry the M-100 with the XL pads and both cables you may want to get LP case which provides more than enough room.