I needed to clean up my footage from dirt on the sensor so I replaced the original clip with an after effects composition. When I exported the finished project it was very "un-smooth", choppy or how to express it in english.
My client is waiting for the the export and I don't have a clue what the problem could be. Original clip doesn't get unsmooth when exporting from premiere without making it a AE-composition first. Could it be some presetings that are not matching in Pr and AE?
Show us some screenshots of Ae and Pr so we can notice the differences. Also try this: render your Ae Comp from Ae and replace with the Ae comp - does it look better? Make sure you Ae composition matches your Premiere sequence too