Should I cover the entire top, or like half of it?

And also, if you don't mind, I'm kinda new to this, the reptile store where I bought this snake and it's cage from recommended that I use the zoomed's heat pad instead of any form of light, but the only problem is that the zoomed heat pad takes the heat sometimes all the way up to and above 100 degrees. I've tried adding more substrate, moving the logs around but nothing seems to work. Any ideas on how to fix that?

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