It should plump up soon, I try so hard not to overwater them when I'm rooting but I don't want them to dry out either. So I normally wrap them with wet paper towel leaving the tips exposed and then I only mist the paper towel. This way, I don't overwater the plant, which causes root rot.
I don't let the soil stay bone dry though, I think a little moist but not too wet soil, helps. You sure do have healthy tips, looks like you are going to be rewarded with 2 branches.
