Hi,
The temperature trick with the LG's is to get them somewhere where there are no drafts. Let it sit for an hour or so and see where it stops. Adjust up or down just by a hair - literally - if you can feel it turn you've gone too far. Once you get it to your temperature - don't touch it again and when you do (and you will) move it just a hair at a time and then leave it sit for 30 minutes to see where it ends up. I'm having much better luck with mine running it closer to 102 than 99.5. At night I wrap a towel around it without covering up the holes on top. Use the vent plugs on top to adjust temp and humidity as well. I think the LG's are a practice practice practice item. They are also a quit lifting the lid off the bator and messing around with the eggs item. They do much better the less movement you make with the temperature knob and the less opening of the incubator you do.
I'm certainly not a very experienced hatcher - but I have noticed out of the 5 hatches I've done this year - that with each successive hatch, the less I mess around with the incubator, the better the hatch.
Hope that helps. Good luck!
Jenny