With reading your post, I'm assuming you're not from the US and with that in mind sometimes the wording from what one country says to what another says can be differ. This is mainly directed at your statement at being dull and lighter than he originally was. I mean no disrespect either, so please don't take it that way.
With him shedding in pieces that is generally a sign of the humidity not being high enough. You should get something that will measure the humidity so that way you know and you won't have this problem in the future. When snakes go into shed they tend to dull out but once they shed they brighten back up, though with age they do dull out regardless. I know you said the humidity was 70%+, but a lot of gauges can be wrong. This includes digital ones.
If he eats frozen thawed, then that's great but you want to make sure you're heating the food up properly. Do you need to know how to heat frozen thawed food up? Many of us have different methods but I have found through trial and error that mine is pretty easy and has a very high success rate.
The cool side is quite low for my liking and I personally would try to raise the temp up. If you bump the hot side up it may help bump your lower side up as well.
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