My advice would be to tighten up the case with more modules that offer greater variety.
Take out the Mults and use something like Plankton Ninja Stars instead (https://www.planktonelectronics.com/store/ninja-stars/)
With the extra 4HP (x 2) add an FX Aid or two—(you won't get bored using this one. Here's the list of FX you can load: https://fxaid.app/)
Also think about dropping the Doepfer Mix and GRP together and using the 8HP for a Bastl Neo Trinity (really good compact modulation source) or Ikarie (stereo multi-mode filter).
Also the Tangle Quartet is similar to the Quad VCA with 4HP less space and maths can be chopped in half with the Function or even further with Instruo Cnoc.
The MengQi DPLPG is small vactrol based LPG I would especially recommend (https://modulargrid.net/e/mengqimusic-dplpg-black)
Without touching your primary modules, here's an example of maximizing your space:
You now have more of everything with room to tighten it further.