I use the stainless tea balls with a fine mesh. When I fill them, I try not to get any of the powdered hop pellet material in the tea ball and it works perfectly fine. Hop haze, yes, but not floaties.
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The take away was that Mash hopping is a good way to waste hops (at least that is what I got).
Edit - I looked at the presentaion.
FWH has 1.08 to 1.010 times the IBU compared to the 60 Min. control beers.
Mash hops have 0.35 times the IBU compared to the 60 min. control.
When judging for hop character between FWH and control, 5 out of 6 on the panel chose FWH.
Maybe the o-ring is the wrong size?