I double-bagged mine and it still varied by +/-5%. Finally after doing it several times I just took an average and set the hygometer.
Now, if the beads are accurate (1/2lb 70% beads) then when they are freshly wetted my hygro reads 74%. Therefore, I think I might have the calibration set too high.
After jacking around with it I finally said "piss on it", not really because then my beads would be yellow, I spotted a little robusto that was just begging to be smoked and I haven't done anything different since.
Personally, I think you can be somewhere between 60% and 75% and be OK.
If your RH is too high you risk mold and busting wrappers.
If your termperature is too high you risk hatching some beetles.
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