Hey @jdesole,
My first impression is that you're trying to fit too much into a rack this size. Personally I would only go for one or two (maybe three, depending on the setup) voices in a case this size. I would cut the number of sound sources and filters in half, at least.
I think you may be misunderstanding Harmonaig's capabilities. From my understanding it is primarily a chord quantizer, not a sequencer. Also, Pressure Points only steps through sequences on it's own with the Brains expander module.
You will probably want to look into alternate VCA modules in place of Optomix and X-Pan, as they are not "traditional" VCAs. Optomix is a low pass gate, so it will alter what you're sending through it in ways other than amplitude (which you may or may not want). I find X-Pan inconvenient to use a lot of the time due to all three channels being routed to a single output. And the first two channels are crossfaders (but can still be used in a VCA-like way). You should look into Intellijel's Quad VCA or Veils (2020) for more traditional and denser "VCA" functionality, in addition to your Doepfer VCA module.
I think you should strongly consider adding some mixers and envelopes to the rack.
Those are just some major starting points, but I hope some of that helps!
-Chace