Wow. Not only are you keeping track of your rotation, you even memorized the enemy movement patterns. So cool! I've never thought about using Emblem of Severed Fate on Yelan. But dang that was super interesting.
dont know if you are just running sigewinne bc she was part of the recent patch but most other healers/hydro would be more useful in the bloom team due to sigewinnes lackluster hydro app im not personally very versed with how much hydro application nilou does but wouldnt a better hydro applicator be kokomi for furina stacks and better hydro app?
For actual number of effective blooms it is best to do 2 dendro 2 hydro with one of the hydro having good application. This way you can push the bloom ownership to the hydro units so they can be the ones to stack EM and do some really devastating blooms. I was using Sigewinne because she was new but she also does something extra in this team as the team damage was not all bloom damage. Furina pets do considerable damage too and Sigewinne buffs elemental skill damage when it is done off field. She does have a limited number of charges (since I have c1 18 charges) that is shared for party. I would drive with Nahida on field to ensure she isn't eating up Sigewinne buff from Furina and so she can keep the blooms rolling for 3 hydro units. As for application Sigewinne's application is low so the bulk of it is from Nilou and Furina but there is still ample enough application between the 3 to easily deal with the pyro lectors so it is fine for bloom.
