A 5# butt is way different than the mass of a 10# butt. Now that you ave some color...wrapping with some broth or juice etc., can speed up the cook and break you through the plateau, keep the roast moist, and help with the tenderness. However, your bark will soften, but that is a side effect and not a show stopper for me. By the way, if you do wrap your oven works just fine because heat is heat.
The bottom line is... don't push it. And like I mentioned yesterday, naturally pulled pork looks like this. These plugs of meat are falling apart tender, and it's very pleasing for your family or guests to break them down at the table.
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