Help Needed

Here's the beginnings of my Swallowtail. I am using Just Our Yarn "Myne" . It 's a hand painted cashmere that is really wonderful to work with. My only problem is that this yarn is much finer than the yarn called for in the pattern. As a result I will be knitting a few extra repeats. For those of you who have finished the shawl, do you mind telling me what percentage of the overall top width dimension the border is? I'm trying to figure out how many extra repeats I need to do. Thanks! There are more details on my blog.