UPDATE:
1. Found that my thermistor adjustment slide clip (inside refer) was in the UP (colder) position. However, the actual temp prob was in the middle of the plastic slide. I had moved it up, but the probe stayed put. It appears that there was no clack in the wire to allow it to slide up with the plastic slide clip.
I checked the wire inside access vent and sure enough the excess wire had been zip tied together to keep things nice and tidy. I removed zip ties and pulled a few inches of slack inside refer. I also tape the wire nd of the probe so it would not slide on plastic slider and the used a clip to hold slide in place. I moved the probe to the top of the fins.
2. I removed roof top refer vent. I wanted to inspect what was inside above refer. I did find that there is a cavity at the very top of refer between refer and roof. This cavity is approx. 24" wide by 8" tall x 8" deep. I will leave cavity alone for now and test my refer with new probe position. If needed, I can fabricate a piece of sheet metal flashing to remove cavity from upward flow of air. Not sure if I can make it fit by just cutting back wire mesh.
3. Fans....How well with they sucking air up and out of vent if mounted above wire mesh? I don't want to cut into the wire mesh to mount them just underneath wire mesh if fans will work as well above mesh. I wonder if these fans will work well enough to make up for the cavity above refer? I guess only testing will tell.
Thoughts?
