I found a little trick during Parasite Cage battle : the gastric juices hit Sora after a certain time. But, when Soras's hit, he stops the attack he's doing (and the combo, too). Lady Luck has something useful in this case : the first hit of the combo deals more damage than the finish. So, by using the gastric juices, I could stop the combo and immediately attack again with the start of a combo (that wouldn't work without the Sleights).
Unfortunately, I couldn't get Berserk for one reason : the enemies and the boss are too slow to attack in this world. So, I used the Card Soldier Card : Attack Haste.
The battle against the Heartless at the end of Monstro can be improved but I can't find the way to do that (but I'm pretty sure it can be faster...).