keith88 no that is a bit warm for the cool end 80 should be fine. If you are using an oil heater a baking pan with water in it on top will add a few % to ambient humidity as well. It might help a bit. Keep the hot spot at 90. It make no difference how you mange that as long as you do. (is the snake little? Like under 400 gm? if so a hot spot of 88 is fine)
90-92 is a good set point for the hot spot. It allows for thermometer or probe error and still is 'safe' from over heating. Most thermometers have a +/-2ºF error margin it may be off or not but if you allow for the potential error there are no issues in the future.
The issue with humidity and to a lesser amount heat is the open top. Cutting off air flow is not a good answer. The way the vents are positioned need to change so air flows well but heat and humidity are retained. This is an option for the future, if things are still an issue then maybe it is worth the effort.
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