Try cracking the door open a little bit, Ledeaux. I know it sounds inefficient, but it works for me with my 2 door (I've gotten 25 hours out of a bottle). It doesn't take much and you'll notice the latch is adjustable, maybe for that reason? I still struggle to get temps below 230, but that's fine for most of what you'll cook. I've done nice butt and brisket in the 240 range.
Don't trust the door thermometer. One of these days I'll get a 733, but I've been using 2 Maverick singles just fine.
Don't underestimate the Sun as heat. If you can keep it in the shade (I went so far as to get a small dining tarp!) that helps more than you can imagine.
Welcome to the Forum, and Happy Birthday! ☺