I have an idea!! When that 60% problem was happening I read on their forums that it had to do with the photos I used (from Facebook). I went on the site and edited each contact I had changed through the Facebook app. back to a photo on my computer. After I did that everything synced smoothly again.
I don't know what is hanging up your sync, so I don't know if editing the photos or anything would help ... but you could take a look at it. Also, they do have a forum linked to MyPhone that has an answer.
Maybe that was a little more help than my first post.