I've been away from BYC for a long time - but over this Christmas break I decided to build a new incubator. This is my first try with a water heater thermostat - super simple - got it kicking on & off but it seems the range in temp is huge - it will kick off at 100* but kicks on at around 90*. Is there a way to adjust this on a water heater thermo? WIll it make much of a difference if the average temp is correct? I know Its better to be a touch cool than hot - just would like to see it kick on & off much closer together.