In zoro vs king, Zoro was able to prevent enma from draining his haki by using CoC in addition to CoA
What if this is also the secret to bypassing DF related stamina issues? As we know, haki can be used to enhance DF abilities. Luffy did it with G4, and katakuri also did it to make his mochi more sticky.
The idea would be, by using haki more, you can take the load off your DF. Like for Law, he could perhaps conserve stamina by using awakening simply to make his sword intangible, and not to create shockwaves. Instead of creating shockwaves, he would create a haki barrier once the sword penetrates big mom. It would have a similar affect and might actually be stronger.
For Kid, perhaps CoC could be used to make magnetism stronger.