The car wouldn't rotate
Okayama, slow corners, and the car just pushed. To make it turn I was grabbing first gear and using the engine braking to rotate it. That is a patch, and it costs me on the way out.
One setting
Freed the differential coast ramp, and the car rotates on entry on its own, off the brake. First gear is gone, second everywhere now. The lap came down with it, 1:19.5 to 1:19.0 across the night, theoretical 1:18.97. Garage61 moved to 23rd of 2634.
The quickest lap came on a hot, sunny track, which is not where you go looking for time.
The real gap is the brake
Bigger than any setting. I release the brake too early, before the apex, then feather a little throttle in. It feels safe, and it kills the rotation, the exact thing I was chasing with the gearbox. The fix is to carry the brake nearer the apex and bleed it off as I add steering. Trail braking.
I measured it. At Barcelona, where I drilled this last week, I am within a couple of metres of the reference at every corner. At Okayama, where I haven't, I let go a car length early through the slow stuff. Same skill, one track ahead of the other.
Next
The coast stays. The brake is the work now, and it follows me to every track, which makes it worth more than any setup.