Dang - I thought this thread had dropped off the map, but here it is rearing its ugly head, and I've failed to respond with whatever meager knowledge and wisdom I could possibly impart. But here goes...
On the Bulges group, notice the Colour Adjust shader. This is singularly the most important control of all. Mess with it and you'll have to go to the displacement (secondmost important) shader and tweak it to keep it all in a palatable state. Really it's a balancing act that seems defy the laws of the universe. Same goes for the Grooves group.
You can adjust powerfractal / displacement for the standing structures as well, but you'll find yourself going back to the bulges and grooves and adjusting them, too. As the wise and benevolent Volker says - it's all adjustable, just very sensitive. And you'd have to spend some time to see what does what to what. Believe me, I've trashed more overnight renders than I've cared to say.
If that didn't confuse you, then you understand more than I do about this clip. Again, I only assembled it, not invent the functional parts.