Ken, I don’t want to rain on your parade, but have you considered grist, pH, time, and yeast strain? (I haven’t read this whole thread)
I’ve never used biofine, but I’ve used gelatin more times than I can count. While gelatin doesn’t take time, I get my clearest beers when allowed to sit a few weeks after using a highly flocculant yeast (Bry-97 90% of the time).
I have a Summer Ale (Pale malt + C40, mash pH 5.2 at room temp) on tap now that is extremely bright that had nothing but Brewtan added to the mash and whirlflock added to the boil. I could sight a rifle thru this beer.
I’ll take a picture this afternoon when I pour a pint.
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