Okay, so I looked at your post again at the broarder questions. But, I also have a couple.
From your equip list:
Flash : FL-50R (wireless)
Is this a bare flash 28" off the floor?
Softbox : 20" wide x 28" tall 1000W with 5 daylight bulbs (Temp = 5500K)
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Softbox : 28" wide x 20" tall 1000W with 5 daylight bulbs (Temp = 5500K)
Are these continuous lights? Cool or Hot?
From your setting:
-Stop : /3.9 If shooting behind a backdrop such as this and unless you're going for a particular style, IMO, an aperture of f/8 may have worked better to make sure the entire depth of your model is in focus. The shallow DoF works well with head shots, but again IMO, 3/4 shots don't work as well with blurred effect.
ISO : 320 Is this your max synch speed?
Exposure Time : 1/10 sec A bit long to ask a model to stand still. I would think a shutter speed of 1/125 up to synch speed would be better suited with your lighting gear.
Okay, out of the red... Looking at your diagram, I would suggest to try another approach. Instead of having your softboxes 10' away from the subject (geesh, you must have a warehouse to shoot in
) move them to just out of frame... literally, when you see the soft box in the view finder, back off an inch. Getting the light source closer to the subject gives a more evenly spread and softer light. It also drops the power settings, which in turn increases recharge time (for battery powered lighting). You'll need to decide which is main and which is fill. Set them to a ~2:1 ratio so that the fill is one stop less than the main. Try the main light at 45°/45° (45° off camera axis, 45° above model)....... crap, you've got a third light.... Hmmm, right so, take the third light, put it on a stand and place it behind the model. You can try facing it towards the model for the rim light effect or pound the background for the halo effect.
Another option would be to place one of the soft boxes as a main placed above the model ~12" in front and have a reflector below him to bounce some light to fill in the shadows.