Ain't that an understatement! Even 7 years later, they're still misleading, or confusing at best.The instructions aren't clear
Yes, you're extracting flavors and aroma, all that goodness should go in the FV. You want to add it after fermentation is done, to prevent stripping out those volatile aromas with fermentation CO2.5 days after pitching yeast, I added the zest to the FV. Into a hop bag. The vodka got dumped in too.
I doubt the extra bittering being from the zest, more likely from isomerized AA acids (from the hop oils).those initial pours were way more bitter than I anticipated