Align path layers

I'm trying to make stickers for vinyl and I'm having trouble with the curved paths that need to align with the bottom layer. 

For an example, I put this in outline mode to show more easier. All these lines needs to be together in the same cuve. I've tried to work around this problem with the pathfinder;  exclude, copy path, delete the excess, merge the paths again (because the bottom path needs to be whole) and then paste the old path above. Well, that way sucks and takes way too much time and there is probably an easier way, I hope. I can't use the align-tool because all the handles goes crazy, or else I'm missing something. I'm grateful for any help and excuse my english as its hard to explain 🙂