Theclones,
Do the three buts the same as you would do just one. Your time should not very at all. Use 4-6 oz of wood. Personally, I've never over-smoked a butt.
Take some pressure of yourself. Start the butts the night before. I set my temp at 200˚ starting between 8:00 and 10:00 pm and crank it up to 225˚ in the morning. This should give you plenty of time. Nothing worse than wondering if the food will be done before guests arrive
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Doing just three butts, place them any way you'd like but do put the larger one on the bottom. Place your therm in the thickest part of the big butt and take it to 195˚. Probe in a couple of places to make sure it's done.
When the butts are done, take them out and let them set for at least 1/2 hour. I prefer to double wrap in foil, wrap in a towel and place in a cooler for a couple of hours.
Take them from the cooler and begin to pull or chop, adding just a tad of rub and sauce as you go, removing excess fat unless you just want to leave it in. Serve on a plate with sides or on a cheap white bun. You'll love it!
Take notes from start to finish. If you need to tweak something you will have a reference point.
Hope this helps!
Good luck!