@KriZm and yes. What survives and dies in the same environment and soil is dependent on genetics and root development etc so the ones that live should have stronger genetics.
As for the foliar feeding just mist lightly before lights on and you shouldn’t get any burning if you have good airflow.
As for the seedling you helped out of the shell that won’t usuallt affect rooting or other things unless you damage it. Some seeds are just super tough and don’t come off and it usually isn’t a problem unless the cotyledons are trapped. If they are I’ll remove the seed so it doesn’t block photosynthesis. I haven’t had any genetic issues from it. Only damage from my own doing if I don’t remove them properly.