this website has great information. I will follow it carefully and hopefully little chickies soon !!!!
I just caught this....I hate to be the one to tell you but the LG has a pretty bad rap around here. I've never tried one so have no personal experience but you are certainly not alone in finding it a challenge to hatch with.
If you are using a still air incubator, 99 is really too low a temp. With circulated air you are looking for a temp of about 99.5, and with still air you want to be closer to 101.
Another BYC member, ChooksChick has written a great "cheat sheet" for hatching using a LG incubator. Here is the link: https://www.backyardchickens.com/a/incubation-cheat-sheet
I would really recommend reading it through all the way and try her technique. As I understand it, she has had a lot of success with LG using this method. Good luck!