Good luck with your hatch, too. I kept my humidity lower (between 30 - 35) for most of the time from day 1-18. But, my temp did seem to run a little higher, about 100. I have good sized air sacs, but some are oddly shaped due to shipping. Not sure how that will affect the hatch, though...
How long did it take yours to get out of the shell? Mine just doesn't seem to be going anywhere. Hope it's not stuck. And, the other one piped a small hole, but doesn't appear to have come all the way thru. I still have 11 more to go, but none of those show signs of pipping yet.
And, I'm using a 1588 for both the incubator and hatcher, too.
Keep me posted on your hatch!!