My 3 racks that are on my helix, 2 are AP racks that are both identical, even my tub layout is the same, but my temps on one are where I want them, one runs lower than I would like, and my third I just took in from a friend that was getting out of BPs, along with 10 more snakes, and he was running a cheap zilla thermo on it and it wasn't keeping temps up or consistent so I plugged it in to my helix and it's brought my temps closer to where I want them but after what you said I will get it it's own thermo, and turn my other rack to constant temp instead of having a night drop
Thanks!