Not an expert, but. In general it sounds like you're doing things right. I wouldn't worry too much about higher humidity as long as it doesn't remain that way all the time. If I had to guess I'd say that the extra shedding is probably fine, but some fungal infections can cause extra shedding, especially patchy shedding where bits of old skin hang on. I don't know of any way of determining whether the frog is really sick other than to keep a close eye on it. Look out for soaking more than normal, not moving much and not wanting to eat. Those additional symptoms, especially the lack of appetite can signal illness.