It's tricky to see on that. Is the bottom of the image the trail edge?
As you can see in the following pic (not through a loop just zoomed in) the fade is easily noticeable on right hand side on 1000i print.
The other 2 were old jobs run on our 800. Looks like quite a different dot but both were set by default to run a 200 dot.
https://dl.dropboxusercontent.com/u/3002/Xerox1000i/1000i-vs-800-comp.jpg
Sorry to hear about the problems you are experiencing with the 1000i, I am looking at changing to the Versant 2100 from a Canon Imagepress, on my test prints I can't see the fade off issue using a loupe, how is your 2100 going now? Earlier you said you were not impressed with the quality vs your 800.