Well I guess we are working off of different definitions of auto-piloting because you just described playing smart.
-play defensively
-stay on your toes
-take no damage
I define auto-piloting as throwing out attacks without thinking, which WILL cause you to take damage.
As for the mindgame portion of it, how much damage taken can you justify in the sake of mindgames? 20%? 30%? It seems pretty risky to get information that may not even be valuable because they are reacting to auto-piloting, the very strategy you will be moving away from in 20 seconds.
I say just start by playing smart and adjust while the match progresses.
By playing defensively, I mean camping banana throws or staying a descent distance from your opponent so that you can punish projectile use if they use it, but out of range of melee attacks, and in turn take 0-little damage, you just have to stay on your toes to jump out of autopilot at the right time.
When I'm saying auto piloting, I think it has 2 definitions.
1. Would be the actual 'state' of auto piloting where you throw attacks out randomly or just because your opponent is 'there.'
2. This would be the verb of auto piloting where you're just throwing your bananas at them because they're just there or just staying in place and spamming dtilt/ftilt, but you're not actually in the 'state' of auto piloting. I guess you could kinda say it's somewhat like sandbagging, but not exactly that far.