Wouldn't it be better to buy the plain uncoiled wires and wrap it yourself? I've always wrapped on a 1/16" drill bit and found that a smaller diameter coil gives much better air flow. Even a 0.5mm decrease in coil diameter makes a noticeable difference in airflow.
You'd be surprised how tiny the diameter of these coils are. And why go to all the bother of coiling them yourself when you can get 50 of them already coiled for $4. Try them, I think you'd be pleasantly surprised at how wonderfully these coils work in the Sofia.