To me, dark roasts are all about the bloom. I also think 5 pours might be too many, but YMMV. I wouldn’t grind any smaller lest you enjoy lots of fines.
I bloom 20g of dark roast with 35-40ml of boiling water for 90 seconds and then I do 3 100ml pours every 30 seconds. This is my everyday V60 coffee.








FYI, it’s legit-ish, at least it used to be. You have to spend at least $29 on the nift site to apply the gift card.
Only most everything is $18-25, so you have to spend a few bucks out of pocket to get a couple of cheap doo-dads. Not worth it unless they have something you really need/want.