As long as the eggs are staying plump and aren't getting wet. You're spot on. Your eggs like your snakes will let you know when things aren't right, to much moisture and the eggs will start looking wet and transparent or growing mold, to dry and they start collapsing. I quit trying to measure and stared cueing off the eggs a couple of years ago, you'll drive yourself nuts.
I have some clutches that for whatever reason never really get the ubber full look they always have that one dimple or two despite what I do..
Hope that helps