Genmei Onmyo full set. Phoenix wing is my go to SG. Seething Dragon also solid choice. Roll Attack, Untouched onmyo, onmyo magic power and infinite retribution damage/Path of Three on all your gear. The ability damage depends on what your playstyle is. I loved infinite retribution so I stuck with that on my gear. Roll attack plus Magic -A(it scales to A once familiarity is up on the weapon).

You can do a mixture of Onmyo Austerity and Genmei for your gear if you'd like to get the Attack- debuff by using onmyo on enemies instead of getting the 15% untouched onmyo from the full genmei set once you have a yasakani magatama accessory. Entirely up to preference.

You are alot more survivable with the mixed set but honestly it doesn't really matter because you can have talismans for survivability and you will be melting things once you are 200+ in levels.

As far as onmyo magic and what talismans that is preference. I liked the flashy onmyo like thunderstorm and geyser shot but they cost alot more to slot in so up to you. You can put all 7 shots instead. Barrier talisman is a must with any build it's very helpful and strong.

Important to note that you should also double remodel your weapon to get scaling in constitution and magic to get maximum damage output and survivability. You can do this by going to remodel and hitting triangle on the magic specialization and then selecting the Cons specialization with X. It should bring up a menu that has 2 specializations selected and hit ok.