I'm doing a series of smash beers all using the same yeast same temp same grain. I'm noticing a big variation in flocculation on the current batch (forgot the Irish moss oops) WLP001 by the way. Im assuming I'm going to get a bunch of "DUH" comments but I have always used the Irish moss to coagulate the trub in the kettle for clarity never thinking of it going on to the ferment and conditioning, anybody know?
Ideally when using irish moss, very little of it should end up in the fermentor. It's a good idea to let the boil settle for 10-15 minutes after flameout so that the moss and the proteins it's attracted have time to fall to the bottom of the kettle.
But even if it does make it to the fermentor, it won't have any significant affect on the yeast:
So, Irish moss has no affect on yeast flocculation. If you were to use a different fining that is positively charged, such as Polyclar, then this would cause the yeast to flocculate and sediment quicker.
Can you be sure it's yeast in suspension you're seeing and not protein haze?