I'm going to knit half a ball of yarn in onto each end. That should give me 6" more per side or 12" overall. Once that's done I'll try it again then and see how that works.
I must admit I'm kind of pleased to be able to stitch on this a bit more. It's lovely to work with something so soft and delicate. Its easy on the hands and wrists and this section of the pattern is self-correcting - you know as soon as you've done something wrong so only a modicum of attention is required.