Keep it up, Neal, and you'll get it. If not, I'll be happy to send you some rootings. I have Dark Knight and Worcester Gold; both root well by stem layering as I've found purely by accident when pruning. I love Caryopteris, too!
I think that if ever a mortal heard the voice of God it would be in a garden at the cool of the day. ~F. Frankfort Moore, A Garden of Peace