Oh, I must have missed that lol..Yea he did, he himself stated that he had perfected it to a point where he wasn't a snake anymore, he was a dragon (which is supposed to be something like a superior form of a snake in Japan I think)
i don't think so, he still doesn't have the same physical strength that naruto had neither the sensing ability,he wasn't even able to absorb natural energy by himself,he called his SM perfect because he has an unlimited supply of natural energy due to juugo's cells
No, he didn't perfect sage mode,
in fact, he put quite a lot of emphasis on him being in imperfect sage mode ...what manga are you guys even reading?