I was lurking round merope and Pleiades so i can confirm it about the capitol ships. But then i got bored and went to obsidian orbital for a bit. Now this is where it gets interesting I had a couple of ours left so thought I would go poke around the closest system i could find to the col 70 sector. I don't know if it was just luck of the draw or not but as I got closer to where i was going, I had UA's spawning near the suns in every other system I went into. It was at about 20 jumps left it started happening.