I can definitely relate a lot to this!
I’m also from a guitarist background, with being interested in pedals, effects, and jamming loops leading me to buy my first synth as accompaniment a good eight years ago now. At the time I wanted to get into modular but definitely couldn’t afford it. I finally started building my system mid-year 2017, which by far exceeded my expectations.
However, I too feel something of a frustration that playing and performing modular feels more like programming and tweaking than playing. I’ve gone through a lot of iterations now and feel like I’m getting closer, but the reality is that modular will never feel as immediate and expressive as my fingers touching strings. This is okay though and is why it’s beautiful to be able to play more than one instrument, we just have to accept that there is no single ultimate piece of equipment for musical expression!
What I have found that helps it feel more playable though is choosing modules that have space in their layout for expressive knob tweaking, and considering the module layout in terms of creative flow and access. Other than that, practice. It’s surprising how many different new ideas you can come up with with just the same group of modules already patched. Learn how to change your parameters with less rigidity, generally you won’t ruin a patch (in a musical, performative sense) as long as you stay away from tuning knobs and master clocks (unless you’re really comfortable to do so and bring it back). Learn how to build something up and transform it into a new section and return again. I find that the more I perform the better I get at these things.
Advice on building a case for playability and performance is to streamline it!
This is what I will be performing with at a couple of festivals over the next month (just a couple of small holes to fill), which is feeling awesome as an in-between for something playable and programmed:
It’s pretty big (yet ironically a super portable and light case, it folds in half and sits in an L shape when open), but in a solo performance it becomes a full voiced system, with half of it kind of playing a backing track and accompaniment to whatever voices I’m concentrating on and playing at any given moment. I use the Maths for my main voice’s master envelopes and play with the rise, fall and slope a lot. The Elements in the corner is a surprisingly playable module, and often runs through the Morphagene for more ambient textures. Cold Mac makes a rad master knob, and Marbles offers some great semi-generitive control in my system leaving room for playing other sounds over the top.
I might change out the Brains for a monome walk sometime.
Last thought: I’m assuming you would know some good drummers to jam with. Jamming on modular with just my drummer was the most I ever felt like I was playing it like an instrument, being forced to make it all happen and fit with what he was playing. That push pull worked surprisingly well and was super fun!