Part of your problem is the mixing of different temperatures of light!! You are using sunlight through a window (approx. 5600K) and hot lights (approx. 2700K to 3600K). This is why you can't get a good white balance. If you are going to use hot lights (tungsten) then block off that window to keep from poluting your scene with a different color cast of light. If you use tungsten, then make sure your bulbs are all the same manufacturer and the same age so that all your lights will be putting out the same white balance. To be able to use both kinds of light together, you would have to either filter the light from the hot lights to match daylight using filters of acetate called "gels" or filter the window to match the hot lights. It isn't worth the effort. More hot lights are cheaper and easier to use.