If your BG are still in the teens all the time then you are running at a level that your body is not going to be happy with. Some ketones are produced when there is insufficient insulin in you, and the body is unable to use the glucose from your blood so burns the fat, and the ketones are a side product of this. As for what is too high, if I had ketones all the time I would be feeling very poorly, and would work to get my BG down to avoid this.
As suggested you need to loook at the carbs in what you are eating. Chicken with noodles is a high carb meal, and will often increase a person’s BG very rapidly. It is all carbs that will be converted to glucose inside you, and that include pasta, rice, potatoes and cereals (breakfast cereals are just a bowl of sugar in disguise!!!). Your BG levels are not going to improve on their own. To bring them down, you need to know what different carbs do to your glucose levels, and how much you can eat in order to keep your levels in a normal range (between 4 and 7). If you started to keep a log of your BG before and two hours after a meal, alongside the amounts of carbs your eating at those meals, you will start to get a picture and you can start to change things.