Another reason I ask is that I have a clutch on day 37 which, after an initial humidity issue in the first 14 days (which was corrected thanks to you guys), that after a further 3 weeks at 99% humidity and 88-89 degrees has suddenly dimpled again just like the do before they hatch. Is this right as I still have 3 weeks ish to go.
That sounds right. Eggs can begin to dimple in preparation for hatching starting about three weeks or so before they actually hatch.