I took a look at your picture in Lightroom. It looks a little overexposed, but not too badly:
Lightroom showed some blowouts in the original picture below. You can tell this from the white triangle in the upper right corner of the histogram. But clicking on that triangle highlights the blowouts (in red), and there really aren't many pixels blown out.
Here, I have adjusted some settings to reduced the washed-out overexposed look. Exposure at -0.3 EV. Highlights reduced (-36). Shadows darkened (-60). Clarity increased (+73, might be a bit high). Vibrance increased (+44). I still has about the same blow outs (which weren't many to begin with). I think this looks better. The point is that your image looks easily usable. (You would probably do better than I did with a raw image.)
If you wanted to change the lighting, you might try more diffusion/softening. Some of your shadows are still pretty sharp. The two bright spots on your back drop suggest there might be some leakage around your umbrellas (maybe?). You might try backing the lights away and/or bouncing off of the umbrellas (rather than through them). If you can use a diffuser and a reflector on each light, you should be able to soften it further. (Joe McNally uses two layers of diffusion a lot, from what I've seen, but he uses high power strobes and big batteries to make up for the extra work the lights have to do to penetrate the diffusers.)