you really really do need to figure a way to keep them cooler, it may sound stupid but there are a few extra options if the miners are getting that hot, stick them on a metal sheet (thicker the better to act as an extra heatsink. point a couple spare fans at the sides to turn the case itself into a extra heatsink, and last try to get the room temp down, open windows and doors and stand there wafting cool air through the room if you have to.
Thanks for those suggestions. All of the miners are already on metal shelving with extra fans to ensure maximum airflow. All of the walls are louvered and the doors are open as well.