1 for the experts, using a choke in AZ, CNS ?

The "choke" is actually a fuel-bypass in the CNS: a brass piston normally blocks the fuel channel. You could unscrew the piston from the actuator cable and replace the piston with its spring; it'll keep the choke disengaged.

Don't forget to plug the hole in the top where the cable used to be.
Technically, while the plunger is down (off position) it's sealed off from the rest of the carburetor, but why allow dirt to get into where it doesn't belong?

What GearNut said. Oh, and the CNS stinks!

I started with a CNS3, and after much heartbreak, I got an NT Speed and fell in love with it...until the banjo-bolted fuel-nipple began leaking. I couldn't get it to stop either; once those ring-washers get tightened, you can't re-tighten them properly to stop leakage. I tried EVERY OTHER type of washer too: rubber, vinyl, copper-crush...etc. I actually ended up buying a whole new Speed NT since it'd be cheaper than buying more washers! Well, THAT one eventually leaked too. I had a regular NT that I never unwrapped from a kit I'd purchased that I didn't need, but figured I'd give it a try. Well, I LOOOOOOVE it. No potentials for leaking like the Speed, super simple to tune (if you really need to...had to thicken it up by one notch on the needle this Winter once it started to go below freezing), and it's MUCH better on gas. I have a 29er with a 66cc. The combo gets my fat ass up to 25MPH no prob.

The color of that plug indicates that you are running nearly perfect if not a tad bit rich. This is fine for the life of the engine as it is getting great lubrication. If it is 4 stroking only when you are cruising along at partial throttle and it still revs up to top RPM with plenty of power than leave things alone.
If it is 4 stroking at full throttle and the engine just seems to have poor high RPM performance, install the next size smaller main fuel jet.