Dryer beads might help. They should probably be closer to 50-50 wet/dry. You might want to consider replacing the 70% beads with 65%, or add more beads to absorb more moisture. As for the gauge, it's probably not accurate even if it passes the salt test. They rarely are. Even the best can be off by about 2-3% and 5% error is not uncommon. Judge the moisture content by the condition of your cigars. They should feel firm and a bit spongy under gentle pressure. If they crackle they're too dry. If they split when you smoke them, draw hard or burn harsh and uneven they are too moist. If that's the case, try dry boxing them for a day or 2 before you smoke them. You will notice a dramatic improvement in draw, burn and taste. With a bit of practice and experience you will be able to tell when they are correctly humidified just by gently squeezing them between your fingers.

BWA is correct. People get way too anal about humidity readings. Don't worry too much about the daily fluctuations as long as the cigars remain in good condition and smoke well. And remember that it can take up to a month before the cigars stabilize, so have patience.