Do we think these are yeast or protein hazes?
Thing is auxiliary finings (for protein) and isinglass (for yeast) work against each other having different charges. Apparently it is also possible to overdo the dosage and stabilise the protein/yeast haze!
I've never bothered with isinglass myself, as I saw it as is an acceleration technique, and given time and a good quality yeast a beer will clear. I've never had problem with waiting for beer to mature 6 weeks in cask, and then another 6 weeks in bottle.
Note to Vossy: My 8% ABV brews were matured 6 months in cask, and 6 months in bottle before I started drinking them in earnest, and even then they improved with age and were better at several years old!
I do use Irish Moss in the copper, but use at least three times the stated dose. Also I think that dropping my beer after a few days - while the yeast is still fermenting - into a second FV has a big influence on clarity. You only have to look at the crud left behind in the primary when you do this to convince yourself. I like to cask my beer at or just above FG as soon as possible, and don't add any priming sugars, I save these for bottling.
The other possibility is the quality of your malt and/or how it is crushed. I have always been blessed (a part from my first ever AG attempt which was hazy) with good quality malt. Protein hazes can go all the way back to the malt.
I'll certainly be studying the result of my last batch in much more detail than normal, but not for at least another few weeks...