Ok, what I do if I forget to copy monitor levels is just delete them and create new ones. Or alternatively ill select all my levels and copy them and move them up or down accordingly if they are all off by the same amount, all levels are 2 foot too low for example. It doesn't take too long to reset views and what not. The MEP content should re-reference to the newly created levels once the old ones are gone but it's not guaranteed that they will. If it's just your levels that are in the wrong location I'd go this route.
If its not too late you can copy monitor back to the old model you were collaborating with then run coordination review to the new model and the levels should match up to the new locations without affecting the MEP content.
Edit: I thought about this some more. If you copy monitor then the MEP content will move if the reference level moves.
