I recently came across a suggestion of starting and finishing a thread with a "pin" stitch which I had never heard of before. Off I went to do a search of the internet to find out more.
There is not a lot out there but this was an interesting link
http://apinnick.wordpress.com/2009/08/14/pin-stitch-tutorial-part-1/
Have you tried this method ?
There is not a lot out there but this was an interesting link
http://apinnick.wordpress.com/2009/08/14/pin-stitch-tutorial-part-1/
Have you tried this method ?