Like others have said, don't sweat it. Cigars are amazingly resilient, and can be kept in a wide range of humidity.
Much over the 72% you're shooting for, and I'd start worrying about mold. Much below 58%, I'd start getting mildly concerned about the smokes drying out. Anything between those two limits I'd call good.
It really depends on whether you prefer smoking a dryer or wetter cigar. Wetter they tend to draw harder, dryer they smoke hotter. It's up to you to find your sweet spot.
Me, I like 'em around 62% or so. Once every few months or so I actually look at my hygrometers, just to see if they still register a reading.
For a long time now I've gone primarily by how my little tobacco tubes feel.