Quote Originally Posted by kitedemon View Post
That is a great notion DrDel I had not thought of that.
The seller contacted me earlier, saying the following: 1) I didnt have substrate in any of the tubs so the first step was getting substrate into the top tubs and seeing if the temps went up. And they did, Im getting 89-92 on the hot spot now on one of the top bins, 79-80 on cool side. 2) I am missing the bottom two tubs because they broke on delivery. The seller thinks that the missing two tubs might be the reason: the cool air flowing through the bottom shelf is cooling the heat tape, making it work harder than normal, and its creating inconsistent temps.

Once I get the two missing tubs in there, and put substrate in all of my tubs, then I can re-assess to see how it really works. Im quite happy that I got the top shelf to go to 92 already, so thats definitely an improvement. Thanks for all the input guys!