Your goal is 11-13%, optimum total weight loss, to day 18. What I don't know, as I just watch the air cells, is if this is a linear progression. As in if you lost 7% in 7 days does that mean 14% loss day 14? I would hazard a guess it is linear therefore would raise humidity. You'll want it upwards of 45-50% to slow things down and reweigh day 14. You can always stop loss of weight by finishing last 4 days with 60% if needed.
ETA: I just read a study on quail eggs, viewing data table it's clear weight loss is linear so definitely raise your humidity to slow it down.
To add a bit more...
To simplify weight loss, 0.667% per day would result in 12% day 18 (optimum but obviously not essential):
Day 7 Under 5%
Day 10 6.7%
Day 14 9.33%
Day 18 12%
Oh dear. They actually are closer to 6.5% less, but that is still too much. I don't have much room to put in water containers with this turner, so I guess I would have to put some water in the bottom troughs in my LG.
That sounds about right for dry hatch, Mine stays anywhere from 20% to 26% right now, although since I have had further development I'm on day 11, I've noticed my humidity isn't dipping down as low and we aren't doing anything different either. As far as egg weighing goes I'm not sure on that since I don't do it myself.
This is the first time weighing myself - I wouldn't have thought about it without hearing suggestions on here from Sally and others. Since it was my first time doing dry hatch (also because of recommendations on here) I wanted to be able to tell some way if it was going wrong or not. Our first (and only other) incubator hatch was also in an LG (not this one) and we just put the recommended water in the bottom troughs of the LG, monitored temp with a simple plastic manual thermometer, and didn't monitor humidity besides keeping water in the bottom troughs. And we had a great hatch! I think 18 out of 20 viable eggs?
Oh the stress of knowing TOO MUCH about hatching! If we didn't want chicks earlier in the spring so they would start laying before winter, I think we would just stick with using broody hens!!! So much easier!!!!!