Well, this does start to help narrow down where the others are going, perhaps. If we look for systems on the edge of the bubble which contain Ammonia Worlds, without worrying about whether they're populated or not:
#3 is close to HIP 20567 (uninhabited). It's a bit off the course at 7LY, but last week was particularly erratic for #3 so it could be that - there's nowhere else close enough to the route nearby with an AW.
For #2, HIP 8887 (uninhabited) is just outside the populated bubble, very much on course by bookmarks (<5LY by projection), and has two AWs.
The more distant ones are harder to tell
- #4 could be headed for either Cephei Sector BV-Y b4 (uninhabited) or HIP 15415 (inhabited)
- #5 might be Col 285 Sector BA-P c6-18 (uninhabited), though that doesn't quite look right. Might need this one to get a bit closer.
- #6 has a few plausible candidates, with Col 285 Sector IG-O c6-5 (uninhabited) being the best fit at the moment
- #7, Pegasi Sector IH-U b3-3 (uninhabited) looks like the target
- #8 has two plausible options on the edge of the bubble - either Ek Zi Gu (inhabited) or HIP 30377 (uninhabited) which is closer to the actual edge of inhabited space.
I'll do a proper projection for them later today.