Do you have a lamp that emits a lot of heat ? Because that dries up the air pretty quick within the tank. But 60 percent should be giving you good sheds, though people recommend bumping it up to 70 during shed cycle.
Try and swap out tin foil for plastic wrap to give a better seal for humidity. Most people recommend a fitted plexi glass though for better results.
Also Sphagnum moss around the enclosure and some inside one hide to make a humid hide.
If all else fails try and up the humidity within the room itself via humidifier or something lol. Or if you're willing to spend a bit of money get an automatic mister system.
Also if your humidity gauge is one of those analog ones, try and invest on digital cause you might be getting wrong readings idk.