kest30,
I am also in Az in the low lands about 25 miles from phx. I have never had an issue with humidity. Its nothing I've ever worried about as we have very low humidity except for yesterday and today. You mentioned you get 2-3 z's per plant? I think that is great and I would be very happy with that. I found the the hydro stores have the netting, both string or plastic in case you wanted to Scrog. Best of luck. I will be running Liberty Haze starting in a week or two and I hope I can yield what you do. I will be running only 6 of them, legally of course.