Even post GK, Doffy was dominating Luffy using mostly kicks, barely using strings. Meanwhile Cracker with his sword couldn't dominate an obese base Luffy who could barely breathe, couldn't even take down King Baum.
Cracker could only perform well with his max defense and while Luffy used one of his weakest boundman moves, no higher end ones like Kong Gatling, let alone KKG. A weaker move than KKG (Tankman's cannon ball) had enough force to break through all of Cracker's clones and still have enough momentum left to send Cracker flying across the country. Yet Luffy kept his high end moves back and used a weak ass Kong Organ the first time.