When my company added 767s (with carbon brakes) to our 757 fleet it was immediately clear that manual application of the brakes without an unseemly jerk was just not possible however feather toed you were. And autobrake application was just as uncomfortable at any setting from 2 up.
After much experimentation I discovered that if you landed with AB1 selected there was no snatch and a delicate squeeze on the pedals would allow you to brake manually as smooth as silk.
Within a couple of weeks of this discovery the company banned the use of AB1. Really annoying!
AB1 use is discouraged/prohibited at the majority of operators as in combination with reverse (even idle) it will result in brake modulation. This modulation significantly increases brake wear on the carbon discs vs. a constant, smooth application at AB2/3 settings.