Answering the op's original question of did it set for enough time, I would say yes. It s safe to eat. Like said the smaller the meat the better the coverage and the op probably didnt take into consideration "all" of the time the cure was in the meat. from the start. mix, cure , stuff, and smoke. its was more like 4 hrs with cure which would be a minimum. I too mostly cure overnight unless strapped for time. But 4 hrs to me is a good starting point. I would like to see a better range of cure times in the meat balls. I'm not really seeing that much of a difference between them all. The 24 hr looks redder but they all look cured even at 1 hr