My AP T8s hold humidity well... my one with a 60 watt RHP is holding 60% with dry substrate, but I keep my boa in that one and his water bowl is pretty large in the center.
Adding a 2nd water bowl or moving the current one below the RHP will usually raise humidity as it evaporates the water more.
Adding thicker substrate would probably not hurt either since your heat is via RHP, thin is best for UTH so the heat penetrates more accessibly. I like to use thicker substrate and pour some water in and mix it around instead of misting. Mist settles at the surface and evaporates off faster than if it is evaporating from below a drier surface. (Kind of like gardens.. mulch is dry, dirt below is wet, and it is still more humid above it there than over the pavement)
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