Just my opinion. A but is like a fine wine, I never inject or mop. Just rub with Jan's, and then rub again. Always has a great bark when finished. I have always done my butts on my Brinkman Gourmet Electric smoker's. The water pan is big so I just lift the lid at six hours and add more, I use apple juice in the pan. The element maintains a temp. of 234* my butts are done in 12 to 14 hours. Generally falling off the bone. Your plan sounds great and I am sure you will have great results. I would never foil a butt.
I put them on at 5:00 PM, refill the pan at 10:00 PM, then to bed and pull around 7:00 am. Always perfection.
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