Those mesh lids aren't helping one bit. Try covering a good part of them with Press n Seal (leave enough space for your light of course). Speaking of that light, overhead lights suck humidity - so your problems get worse. Under tank heating would be the better bet for you and for your snake.
You could try picking up some cypress mulch - double milled if you can get it. If not pick out the really big slivers in the regular milled stuff. Just make sure it's not treated with any pesticides. Cypress mixed with aspen makes a really nice bedding. You get the loft and softness of the aspen with the humidity grabbing, resist to mold of the cypress. Cypress tends to be packed wet so you may need to air dry it before use.
You can get a big sort of flat heavy dish (not one deep though that your snake would have to swim in it). Fill it with water and put it on the warm side. The larger surface area will encourage more evaporation in your enclosure.
You can try putting dampened spagnum moss in various areas of the enclosuer and just re-dampen it once daily or as needed.
You could put the tanks in a small room and plug in a room humidifier.
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