This thermostat keeps cycling on and off constantly, I don't know what's up with that.
Where is the probe in relationship to the heat source? This could also just be the fact that the thermostat has a tight swing, is the swing adjustable?
Also consider putting the big fan up front, tilted at about a 45° angle upwards and back towards the lights instead of straight up at the lights, and mount the computer fans up front blowing backwards as well instead of downward this will create better rotational air flow... And if possible you can better this rotational air flow by putting a swoop or angled board behind the lights... I would put the temp probe for the thermostat in the location marked with the green star...
Quick and dirty picture of the concept...
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