116 degrees under the light you are cooking your chicks. That is way way way too hot. A red bulb heat lamp is too hot for a brooder kept inside a heated home.
Can you get the temperature directly under the lamp and in the far side completely out of the heat? Is your brooder kept inside a heated area? Depending on how cool your far side is you might be cooking your chicks. 86F is too hot for a cooler area of a brooder. By 2 weeks the hottest part of my...