I've been thinking about something, but I haven't been able to test it properly, so I'll just throw the idea over here.
Back when the first report of this bug was made I said I wasn't affected by it, and in fact I was finding about the same number of uni weapons and gears. I don't have a DMU, so I usually find just 1-2 unis a day at most. However, I recently bought the alliance boost for chance of finding quality items for the weekend, so I decided to make the most out of it and I run missions almost all day.
My first uni was a G28. After that, it was all armors.
So I got suspicious. I feel (again, I haven't tested it enough to be sure) that it has to do with the 24-hours quality reducion that starts after you find your first unique. Is it possible that the uni chance reduction is affecting guns and gears differently? That is, the chance to find uni guns is reduced as usual but the chance to find gears isn't?
Just a thought.