@halcy Would you like some recommendations?
@PaulFerence sure! (though for the next time, of course, at this point)
@halcy The silverskin is cartilage that doesn't break down under the heat and is unchewable. You're gonna smear both sides of the ribs with the rub, and make sure to work it in to any cracks that are in the slab.
Wrap it up in both pieces of aluminum foil and let it rest for a day.
The next day, you're gonna put it in an oven at 250 F, and let cook for two and a half hours. After an hour and 15 minutes, give it a flip.
Make sure to put a tray underneath it to collect any drippings.