It doesn't have to be significantly clampy. It just needs, a little more. That would make them really sound like the LCD2 to me, with an obvious difference in refinement.
Tomorrow, I will have my vegan LCD2, a leather LCD2, and the MD on hand. Pretty sure with slightly more clamp, the MD will bear a pretty good resemblance to the leather LCD2.
But yes, the Mad Dogs are amazing for the price, and will be my first go to if I need a closed headphone in the future. I'd just have to bend the arms in a bit.
The clamp is very easy and safe to adjust, the internal spring metal is very durable. In the past I left the phones alone, but starting last month we increased the standard clamp force a little to ensure a better seal.
I can do a Youtube, but all you have to do is grasp both sides of the radius in the headband right above each earcup and bend in until you feel the spring "set." Repeat for the other side.