yea i only use one thermostat and the rack has 2 strips of 11" flex side by side(back heat). for the corns tubs i pull them out away from the flexwatt a little while my ball is right on the flexwatt. and the fact that heat rises there is a nice difference in temps from the corns and the bp.

i have ordered a strip of 3" flex that i am going to put on the bottom of the top shelf so i can make a greater temp difference.