Toss the mults. You only need buffered mults when you have to maintain tuning on a CV or something similar that would be affected by voltage sag. And once they're out of the picture, the regular mults can also go away, in deference to using some inline mults and/or stackcables. That'll get 8 hp back for use elsewhere, for starters.
As for mixing, I'll echo Jim's sentiment here as well...while also adding that, since this build depends heavily on two stereo modules for its voicing, you have absolutely no way of implementing those stereo paths via panning. There's no stereo mixer at the end where you might find an AUX send/return, or where you could just basically patch something like the Beads after the mixer and balance that via its wet/dry settings. Can't get much anywhere else with just the image, tho...