Unless you have a really small 6 month old - you really need to be thinking about upgrading your snake cage - a 10 gallon is fine for a baby - but by now your snake needs some more room to stretch out. As for your heat issue any heat device should be out on a thermostat - and that includes lamps - you can pick up a cheapy thermostat at your local pet store for about $30 this will keep your temperatures reasonably consistant. You also need to maintain a good humidity and the combination of that screen top and the heat lamp are killing yours - this is not healthy for the snake - you'll need to figure some way to get your humidity up to at a minimum a constant 50% preferably 60% - you can do this by covering your top, changing substrate adding bigger water bowls, spraying down the cage, etc.
Anyway - hope this helps.
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Tosha 
"Nihil facimus sed id bene facimus"

10.35.0 Ball Python (Harry and Fluffy and gang)
1.0.0 Angolan Python (Anakin Skywalker)
0.0.1 Green Tree Python (Verdi - yeah I know but my kids love the book)
0.2.0 Feline (Pippen and Pandora)
0.0.1 Desert Tortoise (Pope John Paul aka JP )
2.2.1 Fish (1,2,3,4)
0.0.1 Lizard rescued from feline
0.0.0 frogs rescued from pool skimmer