You do not want to lower the humidity, but you don't want the eggs to be too wet. This is the dance that you dance when incubating eggs. From the picture, it looks to me like you could benefit from more medium in the incubation box. I would suggest adding some more medium to the box, and mixing it with the other medium. This will get the eggs a bit higher off the bottom of the box. Then pour some water in one corner of the box, so that the water will sink to the bottom of the box, and provide more water for increased humidity, but not get the substarte so wet that it harms the eggs.

As for the dimples and miscolored marks on the eggs, that is somewhat normal, and should not affect the hatchlings. Some females are just better at shelling eggs than others.

Hope that helps,