1) VCAs. The more the merrier right? My DIY Dual VCA is doing well, but I often find myself needing more control, both over audio signals and CV. Modules that I've been considering for this are Intellijel Quad VCA and Mutable Instruments Blinds.
Veils is an excellent option. I own the Intellijel quad VCA and it is fantastic.
2) Random CV modulation. This is a big one for me. I've been on a quest to create quasi-random CV and LFOs for my ambient generative patches. I've been able to get away with it a bit using Tides and some CV mixing. I love randomly modulating the voices I use! From my research so far, I hear Mutable Instruments Marbles is great for this.
I have marbles which is great for this. But I'm also thinking that you have stages, which (if you update to the qiemem firmware) gives you a 4th stage-type, which is Random CV. Worth looking into and could shift your focus away from a random module and more towards supplementing your EGs. Just a thought.