HD aspect ratio and motion settings madness

I'm working on a project right now that is natively 1440 x 1080 XDCAM. The Editors work in a native sequence, but insert clips from the graphics department in 1920 x 1080, which is our final resolution for going to tape via a Kona 3.

The projects are cut on separate Mac Pro workstations and media managed for delivery to the online suite. The material is media managed to the native XDCAM settings. If we use ProRes we lose all our alpha channels. The last step in the workflow is to send all the XDCAM sequences to Color, then rebuild a final 1920 x 1080 timeline with all the GFX and graded clips.

Here's the problem: it's been a huge hassle trying to move material to a 1920 timeline because Final Cut Pro distorts clips improperly. For instance, if I simply copy and paste all the graphics clips (1920 x 1080, Animation) into a new 1920 x 1080 timeline, it brings distort settings. I can use 'remove attributes' to remove the distort. However, if there are any motion settings on these clips, they get mangled in the new sequence. For instance, if graphic elements have been moved around, they all get shifted in the new sequence and each one has to be repositioned. Ugh.

Is there any way around this? Or does anyone have a more clever way to go about media managing the XDCAM-native projects?

We're using the final version of Final Cut Pro 6 on all of our workstations.