When you talk about temps are you saying air temp or ground temp? My ground temp I have under control and stays at 95 at all times on the hot side, dimmer regulated. The same side as my UTH is a 100w CHE and with just those 2 running temp on hot side for air is 83 cool side 78. When I turn on the 75w red on the cold side the ground temp raises to 97 but I dim down to 95 and the air temps rise to both 85.
During all this humidity stays around 40-50% without mist and 60-70 with misting 3 times a day.