Wrong. Any interference Kurama has ever had pre war arc, was just him saving his own ass. Bruh you seriously need to reread the manga. Sasuke never chidori'd Naruto in the heart. Naruto not only allowed Sasuke to hit him, but he also diverted the Chidori and hit his shoulder instead. It seems the only time Sasuke can connect a Chidori is when Naruto allows it. What's even more funny is the fact that Sasuke was using the given powers via curse mark he received from Orochimaru to put up a fight against Naruto. It's a good thing Naruto was nerfed and held back in that fight, otherwise poor Sasuke would've ended up at the Konaha Hospital. It's been stated quite a few times that Kurama isn't the source of his power and quite frankly if he never had Kurama in the first place, Naruto would've outclassed him in every way. Speaking of Vote 2, Naruto was the one doing all the work, not Kurama. It's hilarious though because Naruto again was nerfed and held back, just so he wouldn't kill the little Uchiha. Hell, Naruto in BASE was doing well for awhile against a Sharingan and Rinnegan (Not Rinne-Sharingan lmfao) active Sasuke. Naruto in that fight only fought to match not to win nor kill. Oh and borrowed powers of any kind aside and Naruto still wrecks Sasuke.
But do you and keep believing your fanfics.