Thanks Hoogl. I'm starting to realise patience is the key. I've read on various pages that pork should be 90 mins per pound, at the end of the day its temp not time . I smoked a 4.5lb pork last week thinking 7hrs but I shut all the bottom vents and I think I stopped the heat circulating properly. Probably needed at least 2 hrs more. Every days a school day 😆