I played around with the regenerative braking today using my programmer. The factory setting for neutral braking is 10% . I had been driving with 12%.
Today I tried 30%, 25%, 20% and 15%. The car drives a lot different with 30%, 25% and 20% neutral braking. 15% felt the most comfortable to me. I could feel the car decelerate when taking my foot off of the accelerator for gear shifting with the higher values. You had to keep pressure on the accelerator at all times to avoid this. There's a little of that at 15% but not much. So I will leave it at 15% neutral braking for now.
I now have over 1000 miles on the car!