Just wanted to update on earlier comments I made on this thread since my exploration has been going on. As things happened to me, I still stand in my position that ELP are found pretty much by "luck".
To be clear, no, I don't think they are randomly placed. They are not. They are all within the goldilock area of the stars, and with that, the found ones are consistent. The caveat is that EVERY SINGLE STAR OR COMBINATION OF THEM HAS A GOLDILOCK ZONE IN WHERE TEMPERATURE AND TIDAL FORCES ARE BALANCED ENOUGH FOR AN EARTH LIKE PLANET OR WATER WORLD.
Case in point: after spending 19 days and 11,000 ly targeting mainly F, G, K stars and finding not a single ELP, I finally stumbled upon one! It was orbiting a G star, I must say and I was very delighted to finally break the "curse" of this expedition. Next thing you know, I am routing now fast mode, and not cherry picking FGK any more....Lo and Behold, not two days later I find another ELP, orbiting an M class star!! And next day and only 13 jumps away, another one also orbiting an M star!!! That's 3 ELP in a span of not 2,000 ly and 3 days!!
As I mentioned before, I reckon having crossed a very dry and large area of brown dwarf stars that contributed to that long journey before hitting an ELP....even when in theory they shouldn't bear such planets, the record is held by a player who found 4 ELP in the same system precisely made with Brown, Neutron and Y stars...
When you do the math and chances, turns out you pretty much find them by luck. So now I travel economical just because visiting more system increases the chances to see one purely by number, not by distance. But that's my opinion.
No wonder I am still 16,000 from Sag A* as I am completing my 4th week of exploration...lol..