I've had the same issue with Flexwatt melting plastic holes randomly in ideal conditions (rare though).
I've been using Flukers heat mats (a lot of them +++) on my custom racks now for the last 6 years (regulated). They have changed the design slightly over time (not sure if better/worse). They can't get the temps of Flexwatt at full 'on', but, I don't need those temps on a UTH.
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