My second clutch of eggs ever, first of this year was laid on monday. I put my really nice thermostat in the egg box, well the probe is in the egg box. I have it on the proportional heating, and I noticed a lot of vary in the temps, dropping down to 88, and than going back up to nearly 91. So I changed it over to on/off heating. Which is normally better? The pulsing or on/off heating? I made this incubator out of a cooler last year, and successfully hatched out my first clutch in it without any problems. So I just wanted some input. The thermostat is a Vivarium Electronics VE-300. Thanks