The light from each flash needs to be equalized if you want the background paper to be equally white on both sides. Light falls off (diminishes in intensity) very quickly at close ranges, so a very small amount of distance adjustment can and will make a big difference in the light intensity--at close ranges. At longer ranges, the fall-off is not nearly so dramatic. Soooo, to make the left side pure white and not very light gray, it needs more light, and the pill bottle needs a little less light.
As for the pill bottle/background blend, a slight exposure change could help bring out the difference, or a slight adjustment of the actual lighting. Either approach could be used, or a combination of both approaches. It looks to me like the pill bottle is actually over-exposed on the very end at the top right of the bottle; but notice how the bottle's exposure drops a little bit, to a recognizable edge just one inch away from that top,right hand corner? THAT is what I was talking about above--the inverse square law. You can see that the light is too bright at one point, and then it drops in intensity just a SMALL bit farther away, but then across the entire remainder of the bottle's width, the entire thing looks white. When your lights are set so,so close to a set, there is a huge amount of fall-off at the close ranges, and then a more-gradual, almost imperceptible amount of fall-off. At longer distances, the lighting is in fact, pretty even across the majority of the set.
So...some adjustments need to be made. Shoot with the light not quite so close to your diffusion material sides, and you'll have a more even, more easily-controllable light.
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