User blog comment:Blackendedsoul/Devil Fruit Limits and Physical Ability/@comment-3075024-20120122200207

Nice theory Soul, agree with them all. User's physical capabilities and training are what makes the DF powerful.

Few examples:

Lucci: If Lucci's DF was eaten by someone like Buggy, if will be as useless as used-diaper. In hands of Lucci who has trained for so many years and his physical capabilities surpasses the limits of monsters.

Gura Gura No Mi: Now in hands of Whitebeard this DF was really devastating but it was just as devastating in hands of Blackbeard. The reason is Blackbeard's physical capabilities. He has the strength to make same amount of quake as Whitebeard.

Gomu Gomu: This DF evolves as you train more. If BB sucks this DF then he won't be able to go Jet Pistol the same day. It will take him some hardcore training to reach that level as Luffy.

So yea, every DF holds its method for advancing to next strength level.