I used two Quantum Q-Flash lights with their 12in soft boxes attached and set them slightly behind the subject to allow the light wrap around his face. Then the Lencarta was put on a tripod and set to roughly four stops less output than the Qs. I say roughly because I couldn't dial the power down enough to achieve the output level I wanted and pulling back the flash from the subject meant I couldn't get the tell tale circle catchlights in the eyes. The ringflash comes with a diffuser 'sock' which reduces the output but could I get mine to fit? Could I heck as like.
I wrestled and wrastled and huffed and puffed with it to no avail. So I went with this in the end. Still think they look OK. A work in progress....Here's a few more images