Welcome to the forum, Steve, and congrats on a wise purchase!
The Smokette only goes to 250*, so if you wanted a smoker oven that makes 320*, this ain't it.
The temp swings are normal.
BBQ is a patience game.
You should allow plenty of time to get those butts to 195* internal. Lots of folks put them in at bedtime on 200* and then turn them up to 225* or 250* the next day, usually when they see the meat temp has reached a 'plateau', or when it seems to stall out and maybe even go down a degree or 3. This is a result of the collagen, connective tissues, and fat rendering out of the meat, burning up the energy as it goes. You can let it ride at whatever temp you started with, or 'push through' by turning up the heat.
What temp did you start at?
Did you poke a hole in the foil for the drippings and airflow?
Did you use a thermometer probe in the meat?
Let us know exactly all you did, and we can critique further, before you call CookShack customer service (2nd to none) next week.
Are you new to BBQ?