Nothing wrong with 60-70 humidity, my average is 63-67% and I add 10-12% for shed. I wouldnt drill any holes and would keep it how it is. What kind of humidity gauge are you using? You can do a salt test on it and make sure it's giving an accurate reading.
Is your thermostat probe in the slot on bottom of cage ap cuts for it? Since your using paper towels I would drop the thermostat temp until you have a temp of 88 inside cage under the paper towel, when the snakes lay on hot spot the weight of them will make it warmer for them.
You could always get a couple of 40w rhp from reptile basics. IMO rhp is the best heating for snake in cages and the fact they heat the cool side as well is a bonus if you live in a cooler house.
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