If you are using tubs, you should have zero issues with humidity. I keep my bp, king snake and Children python in tubs. I have holes on the lid and a few on the sides. The bp and python's humidity is at 60-70% without any effort. My king snake has about 50% which is my room humidity (Florida) by removing the water bowl half the week and airing out her tub once or twice a day when I take her out to explore.
Are you sure your humidifier meter is working? Use another one to confirm. You don't want to mist in a tub as it is less ventilated than a glass tank, risking the growth of mold. You should not need to mist at all using tubs.
If for some odd reason your humidity is that low, or you need to up the humidity, you can cover some of the holes with tape or cloth, make a humid box using a plastic container filled with moss or papertowels, and change substrate to soil or cypress mulch. Using a higher side tub helps trap the humidity better too but not by much.
Once your humidity is at 50-60%, let it be unless your snake is going into shed. Constant high humidity plus wet environment can cause health problems for your snake and encourage mold, which is a nightmare to save your animal from. I use a humidifier for my blue tongue skink (Merauke) and that is only because he is in a 4 foot, low glass tank using basking lights.
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