I have a few questions - prob already asked, but ... The top & bottom shelf dimensions are critical to the proper air flow & temp being equal? Also, what size was the adjusted air vent on the bottom?
After looking at your photos again, I realized my computer fans are smaller than yours & I'd previously wired them together. Would that be an issue?
Temps aren't even yet, so shut off & will make adjustments tonight after work & try again. Also, I'm not using the same thermometers to check temp, but if I've calibrated them, that wouldn't matter, right?
Hey I know that cooler! lol
as far as the fans, it depends on how much they are actually pushing, you may need to put bigger ones in or switch out the supply plug see this for more info on fans and powering them: IMPORTANCE OF FANS and HOW TO ADD ONE! post #58100
You can try to ignore the bottom shelf and see if you have stable temps before you add that one. But the top shelf I would try to get as close to what we did as possible. oh and caeti and I just had the conversation about the bottom vent size, go back just a page at the bottom and read front a few posts!