I did not have any issues when I finally figured out my thermometers were wrong
. Make sure you have at least 2 and one is not digital. I ran my incubator at 99, sorry can't remember the exact hatch rate but it was around 60%-70%. I dry hatch since it is pretty humid here. Just put them in turned them when they should and right before "lock down" raised humidity to 65%, worked great. They were actually pretty easy. I think the less you mess with them the better the hatch rate, SUPER hard to do!
I have 2 cabinet bators and they hatch low compared to my brinsea that I hatch my seramas in. I have hatched them for 6 years and watch humidity and temp. I keep at 99.5-100 and at day 18 stop turning. I find that if they die out its around day14 and on hatch. I keep humidity at 40 up to day 18 then 60 humidity.