Nice job, Tony! It's always a little tough doing multiple items that cook differently - too much door opening for my taste! That probably accounts for the moisture loss in the ribs. At least once, leave the sides for the oven, and smoke the ribs alone, with no peeking or spritzing, for at least 5 hours. Every time you open the door, you lose a lot of valuable moisture. Not such a big deal for large cuts, like butts or briskets, but there's not much meat on ribs - moisture is gold! Just a tip to try, to see if you can tell the difference.
Really nice first smoke - you're off and running!!