The temperature variation of the flexwatt itself shouldn't be all that much, nothing to worry about at least.
The top of the rack will be warmer than the bottom of the rack sinply because heat rises but it usually isn't more than a few degrees.
I aim for 90 in the middle shelf that way the bottom shouldn't be below 88 and the top shouldn't be above 92.
Mess around with the Herpstat, see what works for you what Works for me might not work for you but it is a good starting place.
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