Is this a good idea?
+ leather earpads
a simpler method would probably be to stuff the rear of the ad2k pads, forcing an angle in a similar fashion to the LCD-2s. let us know how the sound is affected, I would be very curious (i sold my ad2ks years ago, unfortunately)
If it is using the same drivers as A2000X, which I somewhat suspect, then you might get a small improvement. A2kX's drivers are angled.
Otherwise, angling the drivers of a headphone that's not tuned to use angled drivers screws up the soundstage a bit. Not sure how to elaborate on that.