I am new to incubators and bought a Hova-Bator 1583 yesterday. It is a forced air bator with wafer thermostat. How much is the temp supposed to fluctuate in these. I have got it with in 2 degrees but thought it should be closer than that. The thermostat will turn off at 100.7 and the tenp will drop to 98.7 before it turns back on. Should I be able to get it closer than that or is that about as good as it is with this type of bator? This is with both plugs out of the top, and I am using a spot check thermometer. Thanks.