Last weekend Leclerc took pole for Austin's United States Grand Prix, but was unable to convert that into a podium after losing the lead at the start and going the wrong way on strategy.
He ended up dropping back to sixth at the finish, but was later disqualified for excessive wear on his floor plank.
The end result masked what has been a stronger spell for Leclerc as both he and team-mate Carlos Sainz have gone through ebbs and flows with how much confidence their 2023 car gives them.
Ferrari's season has been plagued by inconsistent car behaviour over race stints, which it has gone to great lengths to address.
While Ferrari admitted it would need to wait for its 2024 car to find a permanent solution, Leclerc feels the floor tweaks the Maranello squad introduced in Japan have made a significant difference.
Leclerc is no fan of understeery set-ups, but that was what was needed to mitigate the 2023 car's worst behaviour and yield the best lap times. The Suzuka updates, however, have now allowed him to make fewer compromises on how he has to balance the SF23.
"All in all, it's exactly what I've been complaining about since the beginning of the season, where we have a car that is very inconsistent," Leclerc said.
"Once we get oversteer, we lose a lot of overall grip and this upgrade was exactly for that.
"That helped me gain a bit more confidence and to set up the car in a way that I prefer, and to have a bit of a stronger front, which normally is something that I enjoy.
Source: Autosport