man, you got a lot of questions in there, mark. its like looking in a mirror a year ago. i too, had a ton of questions like yours. think of it like pratice in a sport. say, if you are working on your golf game, there are a ton of relative focus points. your arms, head, feet, hips, stance etc. each one changes everything. same with bbq.
i strongly recommend using smokins advice from last year and document everything. then change one thing at a time and observe the difference. and study your notes. attention to all these details will eventually give what you want, then you will realize you are the only one that notices...haha. welcome to the smoking world. love it! oh yea, about that flareup, can you spray the wood during the smoke? also, try cutting the gas burner off for an hour once the wood is smoking. tons of stuff to have fun with.....