Well, I just learned a very important lesson about letting my
eyes dictate my actions instead of my
ears.
I started out using this setup with the Boomstars going into the Doepfer LPFs. And I was beginning to get frustrated at the sound. The Oscillation always sounded AMAZING before, going into the Doepfer SEM filter, but it sounds rather anemic going through the LPFs, and has a weird peak resonance that I thought just sounded rather uninspiring.
Well, when I got round to trying to figure out what role the Subharmonicon was going to play in all this, I felt immediately hamstrung -- then I realized, of course! I typically use the SubH with each VCO going out through the LPFs, which sound amazing when used together.
So, I got to thinking ... and recalled my lowly Dreadbox Eudemonia filter/mixer/VCA. I've actually barely used it since I purchased it because it didn't really work with the SubH the way I wanted it to, and tbh I mostly got it because it's inexpensive and wanted to see what all the fuss was about with Dreadbox.
I took the Boomstars and rerouted them a bit, running them through their VCAs and then into the Eudemonia, just to see if it would sound better.
JACKPOT! They immediately came to life and now it sounds terrific, very inspiring, indeed! (In general, I do tend to think that a SEM style VCO sounds better going VCO > VCA > filter, rather than the typical way round)
As a side benefit, I learned that the filter in the Eudemonia is self-oscillating, but
not in a nice way -- it a howling, screeching, feedback-drenched whale song from Hell. It sounds, in short, stellar.

So that happy accident has now become the intro to the new piece I'm working on.
And it taught me a valuable lesson: just because it looks good on paper doesn't mean it sounds its best; you have to
try everything!!