I'm having a problem with my temperature and humidity being way too low. I'm using a glass 10-gallon aquarium. Aspen bedding is the substrate, and it's about 3/4" deep. There's a hide in the warm side, and a water dish in the cool side. The top is a hinged wire type, and the heating lamp is located above the hide. Here we go...

Temperature: The thermometer is a stick-on analog type, and is located on the glass, centered, about 3" from the floor (to monitor air temperature). It usually reads anywhere from 70 to 80 degrees. This is with a 50-watt Tight Beam bulb. I also have a 75-watt Tight Beam bulb, and it gets the themperature about 5 degrees higher. I put an 8-watt underetank heat pad in the hot side, and when it's turned on with the 75-watt bulb, I can get the temperature up to about 77 to 81 degrees. Again, this temperature is in the middle of the cage. How do I improve this? Our apartment's ambient temperature is usually 65-70 degrees, and won't go above 75 without cutting off.
Night time, I use a 50-watt red IR bulb and the temperature stay within the 70-75 degree range.
Today my wife picked up a combination thermometer / hygrometer, but this isn't going to raise the temperature.

It seems like when the temperature gets around 75 or 80, the snake comes out of her hide and chills out on the cool side (which doesn't have a hide due to the small size of the aquarium and fear of cramping it). I'm not sure if she's trying to cool off or is just warming up enough to want to explore, but she doesn't go into her water dish much (so she's probably not cooling off).

Humidity: The humidity is also a stick-on analog type, and it's located above the water dish (a large Exo Terra) and about 3" from the top of the cage. It usually reads around 30 to 40 if I've not sprayed the bedding in a day or so. If I mist the bedding and cover half of the lid with a damp towel, the humidity will rise to around 50 or 60. The water in the dish is room temperature; the water in the spray bottle and towel is warm. Again, I've upgraded to a digital thermometer / hygrometer and will start using it tonight.

Any ideas for improvement?