You have to do what works best for you and your snakes. If yours thrives at 60% then stick with it. Yes, there are some that range overlaps that of the Madagascan ground boas (Madagascan ground boas inhabit the more humid areas of Madagascar.). This overlapping range is quite humid. But the vast majority of Dums live in arid areas. Bill Love has been to Madagascar many times....I've known Bill for over 20 years and if he says it you can believe it.
Btw...even this arid area of Mad still has trees, brush and leafy plants, but it is not tropical wet. Dums hide in this leafy area in camouflage waiting for prey to pass by. I've kept Dums since they were first available in the U.S. I keep mine VERY dry except during breeding. This has always worked well for me. But maybe it's just me...I think most people keep ALL boas and pythons to humid...heck I even keep green anacondas, blood pythons and GT pythons very dry (except when in shed and breeding) with no problems at all.

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