I'm finishing up my homemade incubator and test running it in preparation for the Chinese New Years Day hatch. Now that I have the trays in, it seems like I have some thermal banding... I have a good sized fan blowing horizontally at the top of the incubator and my heat sources are all at the top. I have the temperature probe for the thermostat inside of a small water wiggler. Will it matter if there is a little more temperature fluctuation at the bottom of the incubator compared to at the top? Would there be a problem if I had the fan blowing straight down or would that affect the eggs right below it too much? Where in the incubator would be the best place for my wiggler? Thanks!!