Good call. And elevation if high up. Possibly type of egg too. Even assuming all chicken eggs, some have different ratios of yolk to white. We might be in the weeds at this point though.
Also, is this starting from refrigerated eggs (USA-style) or room temperature (everyone's else)? I assume this makes less of a difference with your second method.
But timing it is surely much easier when the water is boiling. If you just slam it in cold water then you are at the mercy of whatever stove you are using
Very mildly and primarily the egg white, which most people aren't eating in its liquid form. The important thing you want to time is the state of the yolk.
In my own experience boiling hundreds of eggs over the last couple of years I found that if I don't start with boiling water then the shells are very difficult to get off. If I start with boiling water the shells slide right off.
From what I can tell it depends on the eggs themselves, maybe their freshness, but it is almost always a certain batch of them that have this issue. Doesn't really matter how you boil them, or if you put them under cold water afterwards. They'd be hard or easy to peal regardless.
No I'm not and I don't store my eggs in the fridge. There's still an inconsistency with the peeling though and it seems to be rather random, but often with several eggs at once.
The whole cracking egg thing is way overblown. For the longest time we poked holes into the side with the air bubble, turns out that didn't actually do anything either (so we stopped that). It could be that faster or slower heating or the shell makes cracking more or less likely, but unless someone actually (scientifically) tests this, who knows?
The hole does work too though? It helps release inside pressure from the heating process. I pretty much never have an egg crack from doing the poke and putting them into the cold water immediately. Meanwhile, not doing either one of those things and they almost always pop.
Just because there's a logical explanation for why it could work doesn't mean that's actually what happens, or that pressure is even the dominant effect causing cracks.
Cracks could also come from bouncing around in the water, which could be solved by holding them up in some way. Or it could be weak points/areas from not badly formed shells from hens living in too tight quarters or being malnurished, where buying eggs from more humane sources would solve it. Or a combination, where the pressure differences in the water from rising steam bubbles cause uneven water-pressure on the egg, but they only crack when they are sufficiently weak to begin with, so just putting less water in might be enough to not make em crack (cause then there's also less water pressure). I could be the packaging, that some eggs develop cracks during transport and they then make them vulnerable, so more local or differently packaged eggs wouldn't crack at all. As you can see, it's not that hard to come up with logical explanations and just doing a few things differently might just solve the problem, and even then the reason it was resolved might still be something completely different than we thought.
For comparison: I haven't poked a hole into an egg in a long time, and I think I had like one or two crack this year. My eggs come from the farmer one street over, and the hens are freeroaming with plenty of space. They don't get transported at all. Sometimes, I use a steam thingy to boil them, sometimes in water. Even when I did poke holes in, some eggs used to crack anyway, and I'd guess 1 in 3 months in a pretty good guess as to what the frequency was, that's why I said "roughly the same numer" in another comment.
I stopped doing the "pokey thing" and have had roughly the same number of breaks at before, maybe even less (one less point to fracture from without the hole). Subjective interpretation of the effectiveness is useless, as we humans are subject to so many possible bias that's it's impossible to be objective, no matter how hard we try. You can't even eat enough eggs to have a statistically relevant sample size, let alone one large enough to determine if it does or doesn't "help a little".
You "feel" it helps. That's ok. Also ok to act on. It's just about boiling your own eggs.
I‘ve never had a single poked egg break. If I don’t they regularly do. That’s not statistically relevant, sure, but in my personal statistic it seems to work.
I wrote something about this in another comment just now, and while cracks in eggs with holes weren't frequent, they still happened for me. I have been taught to poke holes in when I was young, and just always did and assumed it was needed. Now I stopped and nothing changed, basically. But it also means I have no point of comparison for how often they used to break without having poked holes, since I just never cooked them like that in the (distant) past.
There's also no real downside to poking holes either, so why not if it might help. I have just misplaced my hole-poking-thingy anyway, so that saves some space in my drawer and not having to get a new one.
I measure from the moment the water starts to boil. 4:30 minutes is a good starting point if you want the yellow to be soft but as mentioned, amount of water, pot, your stove, egg size, it all affects the boiling time quite severely. I wouldn't add or remove more than 15 seconds either if you want to find that sweet spot because it is definitely not like in the picture. 7-8 minutes is pretty much hard boiled for me, but maybe those are some really fat eggs.
True. Also you can modulate the cooking a bit when you stop it, I empty the hot water and barely cover the eggs with fresh water, letting them cool slowly. For example.