The power matching curves (h1, h2 etc) only come into play if the temp is getting within one degree of the set temperature and you just want to bump the power up to make it the last few tenths to get even closer. If the temp on the display is less than one degree from you actual setting then its feeding full power to the heat device (same as plugging the heat device straight into the wall). So if the temp never reaches within a degree then its not the thermostat its the ambient temp / power of the heating device.
For people who put the probes directly on the heat tape you will always have to experiment with higher temperatures to get the right temp in the tubs. If you want to take the easy route put the thermostat probe in the tub, set your tub temp, and let the thermostat do the work for you. Just use clear packaging tape to secure the probe in the tub closest to the heat source. Never use aluminum tape to secure a temperature probe or you will get false readings.
Hope that helps.
Dion Brewington
Owner, Spyder Robotics
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