I don't know about the hop dust, gelatin may work for that. It seems like there has been some misconception about how gelatin works in beer, though.
Gelatin DOES help clear suspended yeast. For source, see this article: http://www.scientificsocieties.org/j...7-0128-540.pdf
. For those who say "TLDR" check this:
"The mechanism of clarification using bovine gelatin is similar to that of collagen in that positively charged gelatin molecules attract the negatively charged yeast cells and colloids in beer, which are then removed by flocculation."
As far as your particular situation, if you have already tried gelatin then I would suggest just letting it sit for a while longer before you try it. I don't know of anything else that could help you.