I have found the following to be the best autobrake setting, given that it’s a rotary control rather than a set of buttons, which would be ideal for the A320.
DISARM - electrically not connected - leave unbound
BTV - unbound
LO - bound to autobrake low
2 - bound to autobrake medium
3 - unbound
HI - bound to autobrake max
Then you can set the autobrake to low, medium and max as desired by moving the rotary to the appropriate position AND then moving it to the nearest unbound position (BTV or 3). The autobrake setting will be remembered by the aircraft, and when you hit the brake pedals the autobrake will be switched off, as it should. If you leave the switch in any of the low, medium or max positions it will force the autobrake on, even after you use manual braking.