I like farkas's suggestion, actually. A build of this size could 100% benefit from a comprehensive mixer like that WMD, especially if you pick up the extra fader and mutes modules. It works very well as a final level VCA per channel, plus also, something like that can handle your autopanning, put CV control over your FX send/returns, and give you mutes on every input. Even better, if you add Happy Nerding's OUT, you then get one more parallel stereo input that can be mixed with the mixer's output, and this is a perfect way to slot in one more stereo FX return on your main stereo outs.
Also, take a very critical mindset regarding the modules you currently have, and start considering whether or not they effectively fill their spaces. For example, I see a Make Noise Function in the next-to-lowest row, and that occupies 8 hp and only gives you a single two-stage envelope. If you swapped that for a Doepfer A-140-2, you could fit TWO ADSR generators into the same space...or you could go with their A-142-4, which gives you four independent Schmitt triggers (instant attack, manual control over decay). The Erica stuff isn't particularly "function-dense", so you might consider whether something that provides more functionality would be a good substitute for what's there presently.
-- Lugia
i had not seen the WMD with the 2 extra modules. Honestly i really like this idea. The HN out not sure what that would add as i have and out on my black system and black and gold already. but perhaps I am missing something?
I get you on the hp vs function. I get attached to my modules, very hard to part with them. I would almost prefer to justr get another rack ;) but great advice.