I'd suggest getting hold of EDDiscovery 4 (it's free). and getting an EDSM account as well. Apart from tracking where you go, it also shows stars that have been plotted by others, and even has maps of particular sectors of the galaxy - the Formidine Rift being one.
You'll be able to pretty much zero in on the exact area you are talking about and have a look at all the plots in the area. For the record, it's pretty heavily mapped. Lots of undiscovered stuff if you know where to look, but the areas I would say are the prime hunting grounds have been heavily visited.
http://i108.photobucket.com/albums/...-10-07 at 9.02.37 am_zpshccg0mux.png~original
That is the Mac version, which is a touch different to the WIndows version, but I'm on my Mac now, so can only screen grab that, obviously. The windows version allows you to show discovered stars, in which case, you'd see a very densely populated area of dots around the area where the pin is. Where the line ends is where I am now, and is just before the suspected "rift" starts, as I'm headed back to the bubble.
There's also a 3d map, which is quite cool...
Z...
Looking at that map made me wonder if "the vain queen" clue is an attempt to give us a cross-fix to narrow down the search area? Don't know if that makes sense & can't check in-game for a while, but note that the CAS, CAM & PER labels are at right angles to the usual Rift search line.