The chakra Kurama gives him goes into his own chakra supply... That means when he uses up the chakra Kurama gave him, his own reserves are low... :| Come on man.
Sasuke forming his susanoo over the cloak surely doesn't mean he was replenished, I agree. However, we can infer that it did help him, because he was in it, and anytime someone has been inside the cloak, whether they tried to or not, their techniques became significantly stronger. Sasuke using Naruto's chakra doesn't mean he relied on the chakra. It merely means Naruto's chakra is that strong that it can boost someone's techniques almost 2 times their original strength. As seen with the shinobi alliance.