the acu-rite temp / humidity guage can be mis-leading. I have about 7 of them. and if I place new batteries in all of them, place them in my incubator on the same level. I will get different readings on most of them. as much as 20% humidity and a few degrees difference.
what I would do is, keep your humidity around 60 - 65% with acu-rite. when he goes into a shed you can raise the humidity some. if he sheds in one piece, then you're good. if not, I would go thru another shed cycle before adjusting the humidity. sometimes it takes a little time after being in dry conditions. (talking about how he was kept before you got him). If you still have problems with the shedding. raise the humidity by using the acu-rite a little. the reading of it could be off. and see if this helps with the next shed. don't soak him before a shed, only after a shed if needed. and when you have him shedding correctly, and after a few good sheds you get a shed thats not as good as what you want. don't panic, sometimes for no reason they will have a shed where it's in many pieces or some stuck on shed. this happens even with correct humidity and without changing anything, corrects itself. I use the acu-rite as a reference, I use how the ball python sheds as my guage to where to set the acu-rite.