K so, dunno why it didn't work 2 days ago but after hitting 85 today I tried again and it was a piece of cake.
For the blue seal I used my regular team of water main with full healing mode, clone, Chojuro, Ao and Darui and Gamaken summon.
For the other fights vs the Pains and the Puppets I replaced Darui with GNW Kankuro and switched out the clone for poison tajitsu talent.
Sage Naruto did normal damage this time so maybe something was bugged the other day since I didn't really change anything :dizzy: