As long as the temps are controlled with a good thermostat, humidity wouldn't be much of a worry for me. NJ humidity should be normally ok. (Don't know what your winter heating situation is.)
Too much humidity is more of a problem than too low - too high can lead to a respiratory infection, which is much more difficult to fix than a bad shed. I would expect your readings to be fairly stable?? ...you have a good enclosure for keeping what you have in. Also, the snake itself can fix low humidity with a soak in the water bowl. humid hides stuffed with spagnum are good for when the snake is in shed, if needed.
Anyway, my two cents.
(Raised all kinds of animals and plants since I was a kid, but new to snakes as well.)
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