Rig several half moon China Balls on all 4 sides walls with dark side of the moon against walls and skirt them or blackwrap them off the wall if your ceiling is not too low to be in frame. Put them on dimmers if you can and have your gaffer adjust your desired light ratio with the choreographed blocking. This would give you soft yet contrasting light without strong shadows when you need it. If your ratio adjustments on the faces works with practicals(not overpowering) it'll look natural yet dramatic.
Walls tend to be your enemy especially if they are white with nothing to break them up.