That's not badly translated Japanese. You don't contradict it with any manga you're saying I ignore, so it's pretty obvious how you really feel lol. Here's the official translation btw, just to see if there's any other interpretations possible for Nami stating that Luffy's in bad condition and that Sanji attacked Luffy to the best of his ability
Oh and because you mentioned Katakuri
Might as well explain how Sanji or Bellamy have anything to do with a guy whose Haki is hard enough to hurt Gear 4 on defense lol
Put the panels where Katakuri is free hitting base Luffy and compare to Sanji, show me Cracker atleast close to that.
At that time during "Luffy vs Kat", he was much more beaten than he was against the whole fight against Cracker, until the very end, where he just gets up and starts running like nothing happened and didn't even looked near as beaten.
The most accurate translation just confirms what im saying, he did his best to hurt Luffy --> trashtalking and beating.
"the best of my ability" is --> Sanji used Diable Jambe and hit hard, thats all he has offensively, there is absolutely nothing to do with "I used my whole arsenal and full strength", do you think Sanji was suddenly trying to kill Luffy?
It's clear Sanji didn't even came close of using his whole arsenal. Indeed he used a lot of strength, Katakuri hit Luffy with "Zangiri Mochi" twice, Sanji showcasing this AP just shows that he has the potential to deal the same damage as Katakuri and even go further by using the same attacks or others. It's not coincidence that he countered Katakuri's CoO, impressing Katakuri himself, something that took hours for Luffy to achieve.
Despite anything, Luffy is just the most impressive punchbag in the show cuz he keeps getting up, well he is the MC