are you using the RHP as the sole heat source? or are you using a UTH as well?
with my T8 i have the RHP thermostat probe hanging about 2 inches above the substrate, not directly under the RHP but as close as i can get, and the RHP is centered in the enclosure. it keeps the enclosure around 80° at all times, though right underneath it can get up to 85° or so, measured with a temp gun.
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