ok, here are a couple things that can help with a little giant.
1. You'll want to rotate your eggs around to different spots in the turners every couple days. Since it's not forced air, they tend to have warm and cool spots.
2. You need some heat sinks in the bottom. It'll help keep temps more constant and help control those wild temp swings. Those goofy little water wiggler things work well for that and I believe rocks do too.
3. One thing that I used on the little giant that I used to use as a hatcher was masking tape around the edge of it where the top and bottom sections came together. It really helped to seal it up and keep air from slipping out that way. Masking tape or painters tape work good for that because they're so easy to remove and won't damage the bator.
I hope these tips help you out. I've since sold my little giant and use all GQF brand incubators. I've been VERY happy with how well they work and hold temps. I have a 1202 cabinet and 2 styrofoam hova bators (one forced air, 1 still air). Good Luck!