There are stiff/clear flat C-MD2s. I've seen a few of them, at least a couple of lime green ones and yellows, and a few of a light red color, I would say "light salmon"...
I had 3 of the salmon colored ones, 2 were really stable, just like my pink gummy ones, and one was surprisingly understable, no idea why. Might be PLH, but I didn't really check for that...
I sold them tho, since I like the pink, soft, gummier ones better. And I already have 3 of those and they're not beating in...at all. :shock:
I don't think they can produce flat ones at will, there are some of them in each batch, but for some reason not that many. Even sponsored players are aching to get more of them.