I think the root of your "problem" is relying on the Humidimeter. Based on reviews, they appear to be inconsistent from one unit to the next. Some say theirs is spot-on, but many reviewers indicate the reading is significantly lower than expected.
I also question whether accepted correct environmental RH necessarily means the cigars' internal RH will, or even should, exactly match it. You've expressed that your cigars feel dry to you, yet made no indication of how they smoke. Could it be that your assessment of what feels dry is distorted by the feel of over-humidified cigars as received from online vendors or so often encountered in LCS humidors?
I smoke in moderation. Only one cigar at a time. - Mark Twain