I don't bother to raise the RH I keep mine between 55-60% and don't change it during a shed and I have no shed issues at all. I don't think it needs to be over 60% it won't hurt but I have not found it to be necessary. I am very picky about accurate instruments so I use calibratable analogue ones that are more accurate than digital versions that are a reasonable price range. I check and calibrate them every 6 months or so. The digital ones I have used if they were accurate when new (60% of mine were) they don't stay that way for long and need to be replaced often. (my longest lasting was a fluker and it is still +7% after 14 months the next best was 12 months and -12%)