Rob, looking at your photographs, there are obvious problems with your lighting setup. Not only contrast, that is lighs only from one side and oposite side it total dark, but there is basic problem with you "lihting technology". Amount of lights you can get from ordinary 300W halogen light is not enough to have decent depth of focus and comfortable shooter speed. I know I had (and still have) same problems.
I use(d) setup with 3 ordinary 500W halogen bulbs, and that was not enough too. Please, have in mind that "real" photographic bulbs of 500W gives more light than ordinary 500W bulbs, but with shorter life. So, I would invest about 150 to 200 USD for basic 2 or even 3 lights setup, and for that price you can get, beside 3 light bodies and lamps for 500W, 3 stands, 2 umbrellas and one small (let say about 60x60cm or even bigger if you are lucky) softbox, all of course for tungsten (3200K temperature of light) lighting.
You would be surprised how much real photographic 500W lamp gives more light and make photogaphing easier compared to ordinary 500W bulb, not to mention 300W...
And one piece of warning! Halogen bulbs can explode suddenly, so use glass or metal wire protection screen in front of halogen bulbs (between bulbs and model/subject of photographing)!
Good luck.