I've only done it to the 150 range. Yes, the slicing saves it -- very thin.
Having said that, my mom took this batch and put it into a crockpot with store-bought gravy on Thanksgiving. I had it sliced a little thick for this purpose. After a couple hours in the crockpot, it was tender as hell, with a nice, subtle Weber flavor. When it was time to go home, everyone wanted to-go containers of this.