@Yng I was also using Treachery when running Nihl to get the proc faster, but actually a 60 IAS armor hits the next BP on the standard attack with a -10 WSM weapon. I realized that quite late, and at the time I had burned through all my (dispensable) jewels to craft amulets, including plain 15 IAS ones. Of course it would have been pointless to pick up jewels while running Nihl, so I just used Treachery until the end. But its other stats apart from the IAS are pretty much useless for these runs. The FHR was put to use every once in a while, but I would have definitely preferred the next BP for the occasional faster proc. It's a small upgrade, but could be worthwhile if you have a couple of 15 IAS jewels lying around (ideally with other useful stats ofc, but even plain I would have used).