Thanks Rapid,

I have procured an detailed photo instead of the exploded view diagram I have, and am going to pull the drums and verify everything is connected/routed properly and double check the leaks. Hopefully, that will reveal the clunk.

The leaks as I observe them with the car on the ground now are likely residual fluid from the extensive bleeding efforts I have undertaken.

Thinking about it, I'll get a hardware kit and pull the whole thing apart and clean everything up.

It seems like an internal leak as well to me though. The MC is a bran-new KH (under warranty - doesn't mean it isn't bad), bench bled before installation. I flushed the fluid in the whole system and bled it with a mightyvac. Can the combination valve recirculate fluid?