I see how plotting is different from the actual writing according to the plot, and how the writing changes the plot, but still within the same guidelines you have laid down for yourself.
I have planned every scene, but I have neglected almost all transition scenes between the scenes that alternate two different worlds. The entering of the world, and the exiting of the world. Adding them now. So in general the structure of the plot hasn't changed, but in the future I'll know to account for transitional scenes.
What a fascinating process.