Heard back from Mark Lawton, after asking specifically where and how the wood cups get damped.............and I got a sales pitch for buying new cups.
Earlier I said the cost differential vs Martin was only $30......well, what Mark said in his email is their new line of Exhibition Grade Bubinga Cups are available pre-order for $369......and after launch the cost goes up to $429. Yes, you read that right. Said he didn't know if/when he'd have the Luthier Tonewoods available again so the $289 price on the website may never be a reality again.
So an economical cup upgrade is limited to Martin Custom, which is fine since his work is excellent. I was just surprised to see the price jump so far with Lawton. Mark revolutionized Denon modding and I have first hand experience with his product on two headphones. I respect his work and know its first rate.
Mark's cups are deeper, aren't they? And aren't Martin's cups closer to stock size? Maybe that's the reason for the price difference.