that's all cool when it comes to preference in hook size. For float fishing I generally use a #2 for wool and similar sized offerings and if it's real clear a #4. For rubber worms, gooey bobs or small tied egg sacks I use a #1. If I'm using roe or prawns/ghost shrimp i go to a #1/0, all Gamakatsu , black, barbed but pinched, I don't like the new barbless gammi's shape, they havn't worked well for me.
for those who use the bigger hooks as a multi purpose hook, to each his own, but on those days when the fish are not biting well, try downsizing both leader diameter/strength and hooksize. It makes a difference believe me. I have Very rarely seen a flaw with black gammies and having been using them for over 15 years, 4 years of eagle claws and then i smartened up hehehe. But use what's in you budget, they will all catch fish.
As an example, I am looking at a picture on my wall beside me of a 42lbs fresh chilliwack white spring, caught in the upper river. the set up was 15 lbs mainline, 2ft x 8lbs maxima ultragreen leader and a #2 gammi with a small chunk of roe and white wool. This fish was landed in the run accross the river from "the slab" on the upper river, 100 or so yards down river of the hatchery or limit hole, fished from the back side. That is faster flow in there and it was a real challenge but the fish came to hand on this set up and I trust it 100% for nearly 100% of my coho and steelhead fishing.
not trying to convince anyone thier methods are wrong, just relating my experience, and I ain't changin a thing