The problem I see isn't with a lack of processing. Rather, this build is really short on modulation sources. You only have the Maths, Contour, and Benjolin here, which makes up one complex LFO, one envelope source (really?), and the randomness that is a Benjolin. No VCAs here, either; I'm not counting the Optomix, as that's really a pair of lowpass gates, and neither a proper VCA nor mixer. Your observation about excess audio sources is spot-on, actually, but the excess is really cramping you here.
Things to lose immediately: the DPO and the very discontinued Cyclebox and its expander. You have a full WMD Synchrodyne setup here, which makes both of those rather superfluous. That's pretty much a modular in of itself...but it DOES need more modulation sources to really do what it's capable of. Even so, it's powerful enough that it would admirably make for this build's "core". Also, given that this module pair is 36 hp, you need as much free space as you can snag, since that's quite a chunk of real estate...so delete whatever is possible, and shrink whatever's left. The Contour, for example...one ADSR in 8 hp, and you desperately need more EGs. While you might have that module on hand, it's not space-efficient here; you could drop in a Doepfer A-141-4 and have four ADSRs under common CVs in the same space, which strikes me as more effective for experimentation purposes. Again, scrunch EVERYTHING down as best you can. Even if you have modules on hand, they're not going to be useful if they take up huge amounts of space when you're in need of other functions that have to be addressed to optimize this.