HR,
On the odor front...Negative pressure inside the grow is a MUST. Regardless of what you're doing for odor control, positive or equal pressure will result in odor leaks...every fucking time. I use no intake fans whatsoever. We have a sealed room inside of a warehouse. The warehouse has 2 - 14" exhaust fans cut into the roof. This provide the air removal in the warehouse proper. The air enters the warehouse via a large screen opening over the storefront door. The grow room exhausts into the main warehouse via 4 - 10" inline fans coupled to 10" carbon filters. The theory here that can apply to all grow ops is that YOU control where the air leaves...it only leaves in those spots...and those spots are carbon filtered. Because the entire warehouse is under negative pressure provided by the roof fans, the little seams around the building have air being drawn IN through them. Even if there was a pile of cured buds just inside the seams, you couldn't smell it from outside.
Years ago...before widely available carbon filtration...we used negative ion generators. I put a huge one in my bloom room. It worked killer. In fact, it worked too good. That mother fucker removed ALL the smell from an entire crop! That's when I started with the negative pressure. I put the ion gen in the attic. I installed 2 - 18" gable attic fans, and cut a bunch of holes in the ceiling of the grow. The attic fans created massive negative pressure in the attic. This drew air from the grow op through the holes in the ceiling. Intake air was provided via 2 - 16" screened openings I cut into the floor of the grow op. The cool air was drawn in from under the house. The bud stinking air was deodorized in the attic with the negative ion generator. Odor free air was blown out through the gable attic fans.
My long winded point is, you can use negative pressure in any grow op settup. For me odor control falls in the category of security which trumps all else. The only fail safe method for me has always been using significant negative pressure to 100% insure no odor leaks. I never use any type of intake fan, because if the exhaust fans ever failed, the intake fan would pump up the op with positive pressure and odor would be pouring out of every crack and crevice. Based on the strains you're growing, I'm sure it wouldn't take much to blow out the whole block with weed smell.