Laurel Meadows
Songster
I use an old Little Giant 9200. Just opening to grab out chicks or flipping pippers back over I rarely loose more than 2-3%. But I also when possible cheat and pop out the viewing window (and yes, usually burn myself on the heating unit, but it doesn't faze me anymore...lol) instead of lifting the top.
I start at 75% and yes it will shoot up 85%+ during hatches, but I use the extra humidity as the perfect times to do my meddling and it comes right back down. I definitely don't think 75% to start is needed for hands off hatchers. If you are keeping the bator shut, you don't generally need 75%+ whatever it is going to jump to with hatching too.
HIgh elevations does warrant higher humdity. It's so funny how something as seemingly simple as altitude can have such a different effect onsomething like hatching or baking.
So glad you are starting to see an improvement in rates!
Yes, she is....I hope it's a she! lol
Do you have the 1588? I seldom see people not liking their hovabators. I want the 1583. The one Ruby just got. I love the viewing window, but I don't want the digital components of the 1588. I've seen a handful of people that do use higher than 65% at hatch have problems with the higher humidity throwing off the controls and having to reset the system.
I have a 1602 still air but would like the 1588...maybe someday lol. I struggle with my Hova when the eggs start generating heat. I turn it down and it still wants to run 104-105. Its less than a year old and it holds temp like a rock until about day 14 then it becomes really difficult

I often run my Brinsea Mini in the same room and it holds temp better, but oddly enough, the Hovabator gives me a better hatch rate every time.
I don't mind if my humidity gets into the 75% range during hatch especially like you said, if there is meddling or assisting going on. I usually just start at 65% so that it doesn't get too swampy in there. Not having a fan, it's like a sauna in there- the babies take forever to dry. I keep telling myself if I'm going to keep using the 1602 I need to get a fan for it!