On my rack, there are some shelves with spots on my heat tape that seem to get hotter than others. This either results in having to lower my overall temps more than I want to, to get these within range, or having some unusable shelves. Not really relevant but I am using a Herpstat 2.

Are there any tricks to dampen the heat by a few degrees in these spots to reduce it relative to the other shelves?

(I am aware of the obvious answer of replacing the heat tape completely.)