I'm no expert and I'm new to reptiles but I've had similar humidity issues with ecoearth before.
Your humidity isn't a big deal, it will lower eventually. I use ecoearth myself and I prefer to buy the loose dry package. My pet store didn't have any of that, so i had to get the condensed brick. So now i had to soak it in water for half an hour so it would expand and it got damp. Like really damp. I thought it would dry quickly but it stayed wet and raised my humidity to 90% closed and about 80% with half the top open. Your 75% isn't the big issue so you should just ignore it for now. What you should be concerned about is if your substrate is damp. If you bought the condensed ecoearth you need to dry it out before you used it. It is unhealthy for ball pythons to sit on damp substrate. I dried mine out by setting up every spare heat lamp i had into the tank (my ball was in her old tank). This was the easiest for me, but you don't have the luxury of experimenting before your ball goes in. I've read that you can also bake your damp substrate in the oven for a few minutes. Although I'm not sure how willing i would be to do that.
Anyways, that's my limited input. My account is new but I've been reading (probably for hours) on this forum and it is a blessing for new owners like me and you
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