I noticed a lot of them like to hang out near lore book locations.

Since they nerfed the spawn rates, it is much harder to find an active one, and likely not worth the effort to farm. But they are still highly noticeable thanks to their bright bluish glow. During a night cycle get on your mount and ride off trail all over the map. Make note of any you find. Each time you take one a new one will spawn, so you'll need to cover the map several times. This is more work, but it's better this way because you will learn where the least trafficked spots are that give you a better chance of snagging a trove.