Personally I would run 167 no less than 8 hours prbly but I've only done jerky from whole cuts except once or twice. Also time is dependent on the
dehydrator and how much you're doing. General rule is when you take a piece and bend it out should crack but not so dry it just snaps. I am not certain if this will apply the same to it being made from ground meat. I do know with grind beef you will need to periodically dab with paper towels as the fat will render out and you don't want that on your jerky.