You can have some shut off, just not sure how many....I know you need some on but I thought two n/a was fine.
Do you have another maf you can try? I’d bet it’s an issue with the tune as most tuners go very rich for safety.
But ya, with regards to your first question, I did with my Green Bullitt, car was pretty tame beforehand, but I have very little self-control in a powerful car......I wanted a cruiser so I put it back to stock save for the slp exhaust, drove it a few times and loved it, but there was a small paint issue and I was paranoid about the kids hitting it in the garage so I sold it.