If you are runway limited and nowhere else to go,and manual braking distance is what you have the yes PLEASE set AB MAX (it will quick in faster than you can lift your feet)then as soon as possible (physically) apply max manual braking.
Agree. If runway performance limited for all flaps up then immediate full reverse on touch down and autobrake MAX but be ready to apply full manual braking if you need more braking than MAX autobrake. Be prepared for red hot brakes once you have stopped on the runway and ask ATC for a tow rather than attempt to taxi with possible brake fire.
On the other hand, if the runway is not limited in any way, then do not use autobrakes and providing full reverse is used immediately on main wheel touch down there may be no need to use any brakes at all, since the spoilers are much more effective at high speed to decelerate, as is reverse. In other words, use careful judgement and energy management and even with a 8000 ft length runway dry sea level, you should not need to apply brakes until around 80 knots. If no float and accurate touchdown point at 185 knots touch down speed, let the spoilers and reverse do their job losing about 100 knots of energy before falling back on manual braking. That means relatively cool brakes to taxi with.