Wow. I had thought of pitching all the bran into the levain to digest, as a way to stay 100% extraction, but I hadn't tried it yet. Bran slices gluten, and you're moderating this.
Yes there are many factors influencing starter flavor. Temperature, hydration, timing, how much to carry over. Desem is a famous corner of this design space. I’ve been favoring lively starter at the expense of other characteristics, but I’ll get more confident.
By expanding the behaviors we can offer, the real purpose of the Sourdough Home is to engage us in a relationship with our starter. As one wonders after tasting bread how baking technique and the recipe might influence its flavor, one wonders after smelling starter how handling technique and the recipe might influence its aroma. These involvements are twin aspects of naturally leavened bread making, on an equal footing.
I sometimes think that these involvements are a scientific process for reaching an objective result.
I sometimes think that these involvements themselves are instead the whole point, and imprint on the result exactly like other art forms. Paintings can reify thought, transferring part of the painter's inner world to a degree that can shake one's soul. Science can't explain this transference. People talk of a "passionate" cook? When one travels, why is eating the food so important to understanding the culture? When food is magical, it achieves this same kind of transference.