Yeah, you're going to need to bump his humidity up for sheds. Between 65%-70% is a good target range. 55% - 60% is a good average range normally, but they need that 15% or so bump to help them during their sheds.
I don't know what type of enclosure he's in, or how easy it is for you to maintain the humidity, but go ahead and get your humidity up to 70% and see if that doesn't help him complete his shed in the next day or two.
Pay special attention to his eyes to ensure the eye caps come off and are not stuck. This is a critical area.
ETA: Just re-read and noticed your warm side temps. You are going to want to recheck all of your husbandry because everything seems low. Hot side surface temps should be 88º-90º, regulated by a thermostat to ensure no temp spikes, cool side surface temps between 77º-80º with ambient air temps in the high 70s to 80º. Avg. humidity from the low 50s - 60%, with an increase to 70% during shed.
If you really want a thorough review of your setup, post a picture here and let us take a look. We can point out anything amiss and get you on the right track.
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