Ahh. Too far away to get together, Joe.
We used to spend our summers, and I mean every day of summer, at Wildwood State Park to escape NYC in the summer. I have a lot of good memories of surf casting Long Island Sound with my brothers as kids.
As others have said, forget the spritzing. I run my MES 40 at 225 for ribs and use a vertical rack (Weber, I think) and dry rub....no mustard or other stuff. The rub is a spinoff from Emeril Lagasse's Rustic Rub with a lot less salt and cayenne. If you want the recipe I can post it. I usually start with the vent wide open for an hour or so then close it about half way.
I don't foil ribs or do any of the other pogo stick and hula hoop stuff you might read about. Just 4-5 hours of straight heat and off to the table. After all, BBQ is pretty much aboriginal cooking. There's no need to complicate things. And if it's a charcoal burner or a stick burner I still don't foil. Or mess with sauces or glazes for ribs although I may serve sauce on the side for those few (misguided?) folks who feel the urge to use it.
I pull the membranes off but have done them with and without membranes side by side and folks have said they don't see any real difference. Personally, I just don't like to chew around the membrane and even though ribs are pretty thin I feel that the seasoning is more uniform without the membrane. The back edge of a dull table knife to get under a corner of the membrane and a bit of paper towel to grip the membrane are all you need to peel the rack in short order.
FWIW, if the meat pulls away from or falls off the bone when you bite into it it is overdone. It should be tender but with some chew and should leave a distinct bite mark when you take a bite.
And I would wait to clean the smoker until after eating. If you wrap the drip tray over the heat element and bottom drip pan in foil it will cut down on clean up time. Don't forget to poke through the foil at the lower drain hole.
After a while you'll get a better feel for what's going on. With ribs I might bump the heat up to 240 or down to as low as 190 based on my perception of how fast the ribs are cooking. Every day, every hunk of meat and every smoke is a bit different..... So, it is really worth your time to keep a journal and once you get close to where you want to be don't change more than one major thing at a time so you get a good feel for cause and effect relationships. After a while things will come naturally and you won't need to refer to your notes as much or at all but a journal can really cut down on how many times you re-learn the same lessons.
Lance