I love my LGs ship it to me I'll take it. Set the high temp at 100, at the warmest part of the day and forget about it. It will drop in the evening about 2 degrees but the temps do not stay stable under a hen. Keep away from windows and drafts.
If the bator is not full fill bator with anything to hold and stabilize temp like water bottles cups of sand, bricks or rocks. Some people cover their LGs of a night with a small comforter, I have not done that but it would help with heat loss, just double check temps first few times.
The only real complaint I have with the LG is when the chicks hatch and become active they peck at the heating element, always scared they will get burned. So I use a DIY hatcher for hatching. I am probably a worry wart on that issue as I have heard of no one where there chicks got burned.
Also it you measured the temp at the top of the egg and it reached 104 it was only 102. I measure mine with a easter egg filled with sand and the probe in the egg.