I meant to also say that your subject is beautiful! Just sitting there while you changed your reflectors around and still ready for the closeups...must be a professional model in fur clothing.
I'm not a huge fan of flash myself. I have taken some pictures of Morgan in his new beds. He closes his eyes with the flash. I have turned the flash off and left it to the ISO to get a picture. But they turn out very yellow. I noticed you mentioned something about that in your post and referenced white balance. I've heard of that several times but haven't grasped the full concept. Perhaps you could have a brief tutorial of that subject sometime when you get the chance.