I use luck elixirs all the time. Perhaps I'm imagining it, but I seem to have better luck in the evening/night than during the day. I doubt there is any in-game logic that decides such things though.
You may also want to consider whom you run with. If you run in a group of 4, the chances may be less than if you go alone. i.e. in a group, they also have a chance for a good egg drop and perhaps this will reduce yours. I've never seen a multi-egg drop in one run.
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