With your set up Woody I would go definitely have a third light, I only use 1 light in mine albeit that is flash, but however many lights you use you still need to position them correctly. Assuming that the light you have are the same wattage you can see from the shadows that they are not place the same. You also need some kind of infinity background if you are going to put larger item in there, but that could be paper, vinyl or preferably something like melamine sheet, I know there are photographic suppliers who can do one, but they will be ridiculously expensive, I will have a look around and see if I can find anything suitable. When you get your tripod it will slow you down and help you position the subject so that you come to use the same angles instead of bending your knees to try and get it right.
Peter