what modules am i missing?
(dangerous question for me!)
just getting into eurorack - using these as an extension of my Model 15 also using Korg Sq-1, EDGE, and Crave, and Drumbrute Impact, Keystep Pro.
Honestly this is a pretty well balanced and capable rack, particularly alongside the other gear you mentioned! This is a matter of taste, but I reworked the layout of it to provide a more intuitive workflow: 
Do with that what you will! This is roughly the ARP 2600 philosophy, sound sources together flowing into filters/vcas then flowing to effects, with clocks, pitch cv, modulation cv and mixers grouped together as well. I find it makes patching a little quicker and easier when you keep a consistent layout along these lines.
My advice for what you should add next: I'm a big fan of using Disting, O&C, and Pams, keeping track of what you're using the most consistently and considering if you want to get a standalone module for doing that thing. For example, I use the Hemispheres firmware on my O&C, and found that I was using it as a min/max and comparator quite a bit, so I got modules suited to those specific uses and can explore the other uses of the O&C again. Happy patching friend!
