4000-6000ppm is too much, and a waste. I don't like the boost bucket. It's expensive and inefficient compared to a tank system, which can be set on a timer and used only when the lights are on.
You should flower under 1200 total watts if you veg under 400. But in that space, it makes no sense. Try adding a second small HPS in line with the first one (two air-cooled hoods on the same exhaust circuit) for better coverage. You can veg under tube flouros (I'd suggest 3-4 2-light 4' fixtures with daylight bulbs, or a single 48" T5 4-bulb system) if you want to save the $$$ on the 400halide and spend it on another hps.
Buy the hood and fan and filter all together. 6" ducting is quieter for the same volume of air movement. Just sayin'.
Azalea bushes smell like skunk. That may be good, or bad. The filter is what you use to mask smell primarily... if it still stinks, something is wrong.