A little choppy?
I too have had that problem. However, I found that making the last frame the "second to last frame" will work to get rid of a pause, and it's a great idea, but I've noticed that it tends to make the images "jump" a little, which, sometimes, can look worse than the images pausing.
If you make the last frame the same as the first frame and offset the image(s) in the last frame a few pixels, this should eliminate the choppiness and the pause.
Keep up the good work.
//: tranterra :\\