Generally the lowest setting available, but I still use the ABS system and the data clearly shows during braking as the blipper activates the rear brake is activated too, even though I swear I don't use it, to help slow the wheel and help stability it comes on.
I'm still amazed how much percentage of throttle opening is used while braking, unto 17% at times all of which must come down to helping with stability. If I use any more engine braking I find the rear wheel attempts to start skipping even with the stock slipper clutch when going into the lower gears. What are you using?