I have pressure-cooked dozens of pork shoulders, and I will say the only instances they've ever disappointed is when I didn't give them enough time (which in a

I have pressure-cooked dozens of pork shoulders, and I will say the only instances they've ever disappointed is when I didn't give them enough time (which in a pressure cooker just means 30-60 more minutes, not hours). give yourself time and don't be afraid to put it back in if it's not falling apart.