don't know what to say, I hear it the same with every pair of headphones I have, it's certainly louder on the THX00 than anything else, and more noticeable, simply because the THX00 has louder bass, but I wouldn't say it's any less controlled than any other headphone I have. If anything I can actually make out the vibration a bit more distinctly on the HE400i, as I think its bass is a bit more textured. I don't have access to an LCD2 to compare, but I can compare it to a HD650 over the weekend.
But I definitely don't hear anything I would call "distortion" on any headphones I own, just variation of clarity and loudness, and if anything I would say the more clear the vibrations on the note are, the more correct they are, not the reverse.