If I understand this right, fwh is adding hops only during the sparge? And mash hopping is adding hops during the mash? How come adding hops only during the sparge adds so much more bitterness than adding for the whole mash? Is it because the water is hotter? It seems like it should be the other way around. If you guys could help me wrap my head around this I'd really appreciate it, because I like the concept of getting more and smoother bitterness out of my hops.