It was not injected and you trust the place you got it from. It was just a very long cook. I would probably eat it since you got it to 199. There are other methods that take longer and lower temps. Maybe put a bit more of a vinegar style sauce to raise the acidity level.
For food service we have to maintain some food safety guidelines to make sure our guest are being served safe food according to the FDA and USDA. The temperature danger zone is referring to the 40-140 range. Food is to be stored either below 40 or above 140. There is a guideline that most follow when doing their cooks. They want to go from 40-140 in less than 4 hrs. It is a great guideline to follow, I do with my smokes. However you can bend the guideline based on personal preference after evaluating how the product was handled and prepped. That is why the question was asked if you injected the meat. With injecting the meat you can add bacteria to the inside of the meat. Now there are other guidelines that are used in the food service industry (HACCP) and they do not have a spacific time the food was to be done or cooked at, that is the process I was basing my guidance on.
My advice is to check your thermometers, look at some of the mods they have on the forum. They will have some great suggestions for your smoker, I was having temp issues and made a couple changes and they were gone. I had a similar smoker and had to adjust the ash pan so the coles would not sit in the ash, made a huge difference in the temps. If you find you are having temp issues either the smoker or meat, get it in the oven if you can, at least till you get the issue solved.
Happy smoking