The case with Itachi Strong Approach was explained the first time we had it- it's not bug, it's intended feature of this SA. So, immune is not working same for skills like Mirroring Vision and ignite cannot be cured. Danzo and Susanoo bros has unlimited initiative on highest difficulity but as I remember- you can interrupt Sasuke on lower ones, with for example Guy.

Jinchuuriki- yh, Hidan is a pain in there- 'cause his dmg is based on HP and they have tons of HP in this mode. I suggest taking interruption and immobile ninjas with you and making sure to take care of Hidan in first place.