Do you unironically think luffy is weaker than unawakened kizaru?
Maybe Kizaru doesn't have awakening? I'm only commenting on what I'm seeing, you're commenting based on what you believe should be the case.
Luffy will likely get more effective as the fight goes on, he'll get a hang of Kizaru and come up with more effective attacks to tag him, but he is absolutely doing everything he possibly can rn. Saying anything else is just a blatant lie he's used Snakeman, advcoc, FS, G5 and he is hitting his G5 limits, as the drawbacks are starting to kick in.
In Kaidou's fight we thought, Luffy must be tired from all that fighting and literally dying, in Lucci's case we thought he deactivated it so it's cool. Right now he's been going for longer than against Kaidou before drawbacks, but not nearly long enough to warrant such drawbacks. Especially if anything below G5 is truly not gonna work on Kizaru.