Since it is a new setup, I have been hand testing all internal electrical devices for heat discharge. Everything seems pretty cool. My problem probably lies in here...
- 2 of the walls in the cabinet I had to make out of a dense type of cardboard. Not box type cardboard, but thinner, smoother, basically a few steps below really thin wood. So.....

Venting locations
Passive intake: When looking at the box, the left wall is where I cut 4" intake. Located as low as possible, near the front of the box. Which I have secured a layer of nylon over to keep dust and bugs out.
Active exhaust: When looking at the box, the rear wall, dead center, as high as possible, is where I cut and installed the 4" high velo. exhaust fan.

Working with pools and aquariums in the past, I was trying to get a swirling air pattern, as opposed to a direct A-B path, to encourage random turbulance as a way to stimulate stem strengthening. I also lack woodworking tools, so it was much easier for me to cut the intake/exhaust into the hard cardboard.

So... have I sacrificed a good intake/exhaust system for a convenient to cut one? It makes sense that the optimal place for an exhaust would be the roof. However, this solution would result in a total overhaul. Maybe putting another exhaust fan directly below the primary? I have plenty of room for it.

As usual... I 100% appreciate all the input. You all feel like extended family. :jointsmile::thumbsup:

Edit: In roughly 30 minutes, temps have gone from 90F with 50%RH... to 84F with 37%RH. Could chalk it up to natural fluctuation... or I found the appropriate space for the oscillating fan.