Well, thankfully after the test run night on Friday where the temp dipped to 98.2 by morning, my LG seems to have stabilized, probably due to my leaving the bedroom door wide open and also having all those eggs in there to help hold heat.
It has been holding steady at 100.6ºF since last night, only fluctuating a teeny bit to 100.8F once or twice. Humidity is holding around 25% (dry hatch). Happy growing little embryos!
I did want to clarify about temperature - I was originally going by the sticker on my new-to-me LG with fan that said to keep it at 99.5 for all hatches! Then I heard on here that 102 was actually what a broody hen's body temp was, and I think Sally's hatching page says 100ºF. So, I have kind-of figured from that that I am ok anywhere from 99º - 102º and anywhere outside of that range I need to panic, aiming of course to keep it more towards the middle of 100ºF. Does this sound correct? Please advise!