I am incubating my first batch using a forced air vertical orientation incubator. I have been using broody hens but have switched to get a consistent schedule instead of hen time. I played with the incubator for a few weeks and discarded the provided control feedback display as it is completely incompetent. I do use the rotation mechanism as it has proven to be reliable. Now my question. I candled at day 7 and have 22 active eggs and 2 clears and 1 early quitter but the air sac is not where it is in the diagram you see to measure the weight loss. I am running low humidity (20-30%). What could be the issue? The eggs are looking good otherwise.