You're supposed to be shooting through the lightbox to diffuse the light. Having them in front of the box shooting onto the product defeats the purpose. If you must shoot with a the lights facing the product I would bounce the light in to diffuse it instead of having bare bulbs blaring down on the product.
I would try to have all the lights the same color temp. Have one shining down from above and one right and left in front of the product but all still shooting through the lightbox. Remember that distance of lights changes the diffusion and power of the light. You can reduce shadows just by sliding a light back/forward a inches.
get a tripod, shoot low ISO, stop down your lens and get a remote trigger.
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