The benefit of keeping your eggs in the fridge is that you get a consistent temperature of 4 degrees and therefore a consistent cooking time.Freshness of the eggs doesn’t seem to make much difference.
Vigorous boil in about 10 cm, give it a swirl add a bit of vinegar if you like but it doesn’t make that much of a difference, crack in the egg, keep a moderate boil going for 2 minutes 20 take it out with a slotted spoon. eat