Never wrapped a butt
193-198 does it everytime
Takes as long as it takes
General rule....faster requires higher ending temp for same result....so if you speed up by wrapping...you may need slightly higher end temp. You shortened the cook time. It takes time and temp to break down collagen.
There is no reason to ever put in oven, imo.
You want pulled pork btw, not pork mush. Yes, you can make mush. That's frequently what restaurants serve because they keep it in a hot pan with liquid for hours and it continues to break down.