Don't be a fool dude...Sasuke was never at full strength the entire arc
He never completed healed from Dei's fight (curse mark didn't heal 100%)
He lost the curse mark so I say about 70% after Itachi's fight
Right after he went to get Killer Bee and after I say he was about 40-50%
Right after Kage summit, no rest, went in and fought some soliders, raikage, gaara, dauri, Cee, Kank, Temari, mizu, chojuro, and he was using susanoo and amaterasu.
He was about 5-10% at best
Then he was healed slightly top I'd say 15-20%
Then he fought Danzo while using amaterasu and rib susanoo to complete susanoo which put him at 3-5%
He didn't heal at all after that and comes Kakashi and Sakura...he was 3-4% but he used final susanoo and was blind so I'd say 1-3%
He was holding his own aganist Kakashi and they were both serious and Naruto comes, he used his full power chidori and was able to clash and even tie with naruto's rasengan...which many say is so much stronger.