I really like the idea of the brooder you built and that is now on the list of projects for this week!
I added another light to the coolerbator directly next to the thermostat and so far all is well. It is turning on/off as it should now, so now is just the minor adjustments to the on/off temp! So far so good. When I initially plugged it in this morning it was cutting on at 97 off at 99, so I just made an adjustment so its a waiting game to see cut on temp. Just cut off at 100! Wish me luck and thanks so much for the tips! It has greatly helped!