Welcome aboard!

If he's a hatchling he may feel a little dwarfed by that tank - make sure he's got plenty of hides to minimize the feeling of exposure.

Now a few questions for you:

What type of thermometer are you using and where are you taking measurements?
Are you providing a thermal gradienst (warm side cool side)?

Low humidity can indeed result in patchy sheds, covering the screen top (moist towel, contac paper etc on the outside) will help retain humidity better) - elevating the humidity when he is going into shed will help acheive a cleaner shed. If the feeders are leaving a noticable lump you might want to cut back the schedule to 5 days.

Never hesitate to ask questions - you'll always find folks on this site willing to take the time to hook you up with info.