For best results you should try to get the air temps up to 80-85F throughout the whole enclosure and use the UTH to attain that 90-95F surface "basking" temperature.

This can be difficult with an aquarium/screen top combo. You may try cutting down on some of the ventilation from the screen cover if this is the set-up that you are using. This will help with air temp as well as the humidity level.

My advice is this... if the snake is shedding fine (in one piece) and digestion seems to be going well, don't alter your method too much. If it ain't broke it don't need fixin!

Good luck!