First of all, congratulations! First clutches are just the most amazing thing.
Yes, the denting suggests the eggs likely require a bit more humidity. You can take a damp paper towel (all the excess moisture squeezed out of it) and lay it on top of the eggs, or you can take some damp spaghum moss and lay it over them instead. I have a clutch that has been curiously sensitive to humidity and I've had to keep spaghum on them (and re-moisten it several times) the entire time they've been in the incubator. A day or two of that, and they should plump right back up.
As far as going off food, that varies from girl to girl. One of my girls is ravenous the day she lays, and yet another is greatly offended by food until after her post-lay shed. I try to offer them something small like a hopper the day after they lay then return to normal meal size a few days after that.
Good luck and welcome! What's the pairing?