I think you are fine at 16 days (for the reasons I already stated) but if 18 days makes you feel better there is no harm in it. Quality cured meats take time so no harm in erroring on longer. Most everything I cure in whole muscle is for 14 days then smoke then rest or equalize for one week 21 days total. With 1.5% salt and .25% cure 1 your total salt is 1.75% and I will not take that past 21 days in cure, it can get a little slimy pushing past there, no harm in it but I don’t like it, you really need salt in the 2.5% range to go longer in cure and I don’t like the taste nor see the need.
As far as smoke, I don’t know your set up nor do I know what you want in a smoke profile. You can do as disco says at 200* to 160* IT You won’t get much smoke that way because the cook will be fairly fast. I like about 5 hours of hot smoke and do a ramp up in temp starting at 130* for two hours then bumping up every hour 10* to a maximum of 170* and IT between 145-150* on pork. Pork is technically done at 145* which is medium doneness this works great for loins or chops, but 160* will give a more firm texture but could also be a bit dry.
Also not sure of your plans for the CB? Fry it for breakfast, or pizza? If you plan to further cook it I definitely suggest smoking to IT of 145* . Tell me about your smoker set up.