I am personally using sogyo for 1-2-2 formation in ryoka with 8th skill and cute orihime and it works well. I tried using zangetsu but it just isnt that good for 1-2-2 (sogyo gets me further in waves), and I currently cant afford to get additional eq and str stones for 1-3-1 being ghost blade and all that. If you can afford running 1-3-1 then zangetsu would be the best. Otherwise sogyo proved better for me with 1-2-2 running noza, sexy yoru after isshin fix + shinso gin and cute orihime.