Miscellaneous: Mistmoore Castle: Deathly Ushers not dropping Black Silk Gloves?

[Qaedain]

Every resource at my disposal suggests that Deathly Ushers are the most reliable source for Black Silk Gloves, one of three components required for the Bard's Lambent Gauntlets quest.

My friend Haurgus and I have lived in this place for the last few days and, after killing hundreds of Ushers, have not seen the Black Silk Gloves drop. We've also killed several Will Sappers and Glyphed Aegides, which are also purported to drop these gloves.

I'm not usually one to petition for this kind of issue (bad luck being what it is in EQ), but I've finally reached the point of suspicion.