Hell Memories could be a mode, and then he'd have used a basic kick in that mode, like he used a basic kick in DJ for the first time against Jabra
Also like i said, there's hardening.
@Cinera brought up how much hardening usage boosts attacks and how Zoro has yet to show some of his moves with hardening post time skip.
Sanji begining to add Hardening to his attacks will add a significant boost to their strength as well.
Also there's the arc to arc strength growth. In Zou Sanji used a DJ named attack to take out a Headliner, but in this arc he was one shoting them without DJ, with unnamed attacks.
HM could be way stronger now, and could be a whole mode, and could be boosted with Hardening. All that without even accounting for the more than significant boost the RS provides on top of that.