That MSCL compressor looks pretty cool. Also, the Erica Drum Mixer has a nice sounding compressor too. That's on my list for mixing my modular drums.
I had initially tried to do everything in the rack too, but found that there were a lot of sounds I was going for that I just couldn't pull off effectively without expanding into some external hardware (and guitars, but that's another story).
Take care, and let us know if you crack the code of the Drexciya sound. :)