To help figure out where the issue lies...where do you have the thermometer placed? It should be down near the substrate as that is where the temp matters...if it is way up high then move it down.

Also, you didn't mention a thermostat to control the heatpad or light? Do you have one...if not you need one so that you can regulate the temps and not end up burning your snake.

Zeke's points are right on too...especially about covering the top if you are using a screen topper (which my guess is you are since you are using a tank)

Make these adjustments and then let the tank sit for a few hours to normalize and then let us know where we stand.

Also, there is no need to feed in a seperate container this will just cause your snake more stress then is needed.