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READ the instructions, 20 minutes is no where near long enough to stabilize the LG. Buy a cabinet door pull, drill it out, and put it over the post, or use a dimmer knob. Mark it so you know where you have been. Make VERY VERY MINOR adjustments. When setting up the bator put something in to stabilize temps, even if it is rocks or bricks. I use pint containers filled with sand, also for humidity control too. Always wait at least 2 hours before making any adjustments, and between adjustments, unless the bator goes above desired. Set bator for internal egg temp of 100 in the warmest part of the day, after you reach this LEAVE IT ALONE. If you use a water wiggler for temp measurement set highest temp at 99F, they tend to read lower than actual temps. If you are going to use the therm that came with the unit, test it next to a reliable source to get the variation. Once you have that write the difference on the plastic part of the therm. You are looking for 102 on top of the eggs, but I found both mine to be 2 degrees low, so I it set for 100(102 actual). To get internal temps use a digital with a probe and put the probe in a easter egg filled with sand, it will be dead on. It will fluctuate as temp rises and lowers the same as it does in the eggs.
Now for setting the eggs. Only remove enough stabilizing medium to allow for the room for the eggs and turning. The more medium the less problems, LGs work the best when full. I use the pint containers with sand also use these to control humidity. Add water to one at a time until you reach desired humidity. Be advised to use lukewarm water, and again wait a while for results. If temps vary a lot in your room, then cover the bator at night. Keep away from windows or drafts, all in the directions.
I get 99% hatch rate with my own eggs, if you are not getting 80% with reliable eggs reread the directions and see above hints. Forget Tool Time and the Tim Taylor method to incubating, Research, Read, and Follow.