Ok so heres the problems.
You used a dome. Wrong. It can work but if you want better results try the same dirt mix you made and let it breath. Seeds after a 12 hour soak mind you, will pop in 2-3 days. You need airflow.
Looks to me that your on day seven, half the seeds have sprouted and the lights on. Wrong. Sprout seeds in the dark. Like a box with a bunch of holes poked in it or a top that doesnt close well but still keeps it dark. THEN, when they sprout, as they sprout, one by one, put them under the light.
Lastly, heat. You most likely have good heat because you have that light on, unfortunately the light has to be on to get the heat....boo. Heat is a really important factor in germination. 78-81 is perfect. Warmer is definitely better than cooler. Getting it that temp is your problem.
I just ringered another 100% germ rate plus one sprouted twins in ffof straight, no pearlite or mixing. So whoever keeps saying its too hot is wrong. 100% ffof and 100% germ with no burn....again
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id use seedling starter mix if i had it but i dont lol.
Damp dirt, 12 hour seed soak, 1/4 inch down, put in dark at 78 degrees with ventilation, 48 hrs later youll have around 70% germ. As the rest pop takem out of the dark and to low light. Dont even open the door for 48 hours, dont. This works every time.