Yeah drop rates can suck on the subligars, and then you'll get 5 in a row or something stupd like that, not much you can do but keep plugging away at it.
Have you not tried Sacarium? I recently spent some time in there killing Fomor for hate, so I could get a new Swiftbelt. I ended up leaving with an inventory full of Subligar, including BST. Now that the lv.cap has been lifted, I think I'd prefer doing any Subligar farming there.
I don't know what's it's like after the cap has been lifted, but Subligar drop rates in the Sacrarium always seemed a lot worse than in the Aquaducts.
I tell you, we are here on Earth to fart around, and don’t let anybody tell you different.