I've got 2 of the 32q racks from RBI and a Helix t-stat. It seems one rack won't get as warm as the other. About a 4 degree difference. One rack will be at around 91 and the other is around 87. I'm using Accurites for thermometers.

Can I put a dimmer in line between the warmer rack and t-stat, and turn the t-stat up to bring the colder rack's temp up?

Or does anyone have an idea why they aren't heating the same. The 2 racks are identical...