I have a home made bator. The air is drawn in through the back right by the fan, then blows across the light bulbs, with the thermostat placed between them. It then travels across the remainder of the back, and circulates counterclockwise to enter the left side of the egg chamber, travels to the right side of the egg chamber. So, the left front of the egg chamber is much warmer than the back right of the egg chamber. I put a curved baffle up high at the back left, as well as a tin foil guard in front of the eggs on the left side. That does a lot to equalize the temp, and brings more heat to the cooler right side. Perhaps you can play around with some tin foil to help re-direct air flow and even out the temps.