Hasta La Motion!

I am having problems with using the interaxial shifter. When applied, it obviously generates some artifact or tearing of the image. This is understandable. My question is how exactly do you go about fixing the areas that have these artifacts?

I tried rotoing back in pieces from the original stereo pair before the shifter was applied but it becomes more of a jumbled mess than before. I’m obviously doing something wrong. I know some kind of roto will be necessary I’m just not sure what to do with it once I have the original pieces rotoed and where to put those pieces in the tree.

Any help will be greatly appreciated. Thanks

James