When you say "surface temp" and "inside" do you mean you are using heat from above and the top of the hide surface is 92 and the substrate surface inside the hide is 86? Just trying to get a good idea what you are meaning. If you mean the ambient inside the hide is 86, that's completely fine. If both are surface temps, I would suggest creating some cover above the hide that doesn't block the heat so much but gives them a feeling of security, like fake plants.