For temps that low, be careful that you don't light too much charcoal, or like you said in #1, you'll be fighting to keep the temps down where you want them. I haven't used my deflector stone in years. For indirect cooks, I just put the drip pan on the lower grill. For low & slows, I don't load any grates, etc. until I see the dome temp start to rise, i.e., have good confidence my fire is going well. Then, I put in my smoker pot, the lower grill/drip pan, and the main grate (and upper grate if I'm using it) and let everything come up to target. Then on goes the meat. By the time the whole assembly gets to target, the smoker pot has usually started as well, so I have good smoke right out of the gate. I pretty much follow this routine whether or not I'm using the Guru fan/controllers.
Hope this is helpful.