Seems no matter the adjustment I make to the water heater thermostat there is a 4 to 5 degree variance btwn the highest and lowest point. The best currently is 97 to 102 since the avg is 99.5, but will this work? I've read so much about keeping temp constant I'm wondering if that difference will mean no peeps hatching? I'm wanting to start with a small batch of 6 to begin with. Anyone have a suggestion? Its ahomemade incubator out of an old ice chest, btw.