I seen many posting all over the internet basically using all the variables I've seen in this post, found an amazing range of what is considered safe finishing temps in various countries, it boggles the mind! First and foremost to me is fresh meat, clean work surfaces and tools, keep it all cold! Then use cure for insurance! I pulled mine off last night when internal reached 153 but from observation of sausage after pulling there was zero fat render so it could easily gone hight, if I wasn't impatient ! I appreciate yours and everyones input, mine is the final choice, I take in all info, research online and it's on me then. Web info always requires research and more fact finding, since you don't really personally know who you're dealing with.