While not all forms of stress means smell,,, all smell is created by less than optimum enviroment.
Generally, nutes, blocks, ph, etc. doesn't seem to be a contributor to smell. (my findings anyways)
Those I listed before are very much key contributors.
Try it.
Take 1 full week and leave the door, zipper, what have you open 24-7.
Do not have a fan blowing directly on them enough to move main stems. Just a little finger flutter is good. Very gentle.
The natural convection of simply being open could very possibly cure any heat to humidity issues, as well as allowing good air flow without gale force winds
Simple test. Try it. What you got to loose? Maybe some filters and fans?
Like I said, I wouldn't believe it either until things got so bad I could smell it outside and that was WITH filters. I was desperate... and it worked.
I'm running low RH & Hi Temps.
Second picture above you can see the blower (set near dead low w/ controler) over the light. No filter. It dumps into chimney.
Below is the intake filter.
Room is completely sealed with exception of the only vent (filter).
5X7 converted coal bin running 2 400w, 1 80w CFL setup, 1 100w T5
(EDIT) I figure the air in that room exchanges about every 20 minutes. Not much, just enough to guarrentte fresh oxygen / CO2.