That humidity level doesn't sound too excessive to me. If the substrate is dry, I wouldn't worry about it at all.
Some of the places ball pythons live in the wild are more humid than we normally keep them.
The 'off' scales happens sometimes when they bump their head on something during a shed cycle. The underlying scales can be slightly damaged and appear odd after the old skin is shed. This can also happen if humidity was too low during a shed, and the skin on top of the head stuck, but they pulled it off anyhow.