My 2 cents as a relative noob:
1) If you go for two sequencers, make one of them more playable, i.e. a Metropolis (unless the Eloquencer fits this bill?)
2) I had similar synth + computer visions to you, but I tend to totally forget about my computer when I'm playing my synths, they have a lot of magnetism and computers are terrible in comparison, so there's some chance you may not really want to use your ES-9 all that much
3) With a rack this size I would absolutely want at least one and maybe two analog voices, they just sound so good and they do a great job supporting your digital oscillators and adding weight (Ensemble Osc + a Dixie bass sine underneath it 🔥)
4) Realistically I'd throw another Maths in a rig this size, or a Serge DUSG, or a FrapTools Falistri, to keep things interesting, and tangible, but moving.
5) I'll second @farkas's suggestion to make sure you have some filter variation, and personally I haven't been blown away by this year's Ripples.
6) As always @jimhowell1970 is right about utilities.
my tunes: https://stevehand.bandcamp.com/