Im assuming the 90-85% or what ever is for if you think 100% assistance is too light even at parking speeds, so you can set it at say, 80% as the maximum assistance from standstill, tapering off to nothing at 35 mph.
Does anyone else think 35 mph is to soon, i'd prefer around 45 mph at least before assistance completely disappears! even then, sweeping bends on A roads at 50 mph, the steering still feels a bit heavy to me if im honest. I think i'd actually prefer about 20% as a minimum, so never actually unassisted
Maybe im just to accustomed to modern steering, or im getting lazy or to old, or all three!