I'm pretty sure there's no need at all for anything higher then 1 as the wheels don't lock anyway. As for ABS on or off, you can be just as fast with or without, depending if you're good at braking or not lol
The best turn to test your braking with ABS off would be Trial Mountain the last turn of the final uphill section where it drops, you have to feather the brake on and off like a throttle and it feels good to drive like that, you feel 100% in control of the car and the feel of the road, which with practice can actually make you more consistent. ABS doesn't just prevent the wheels from locking, it also increases stability under braking too, with ABS off you are more likely to sway left / right under braking than with it on.