I had the same problem. I took two strips of abs, about 3/4" X 6" long. Glue 3" worth onto the kidney portion. The 3" under the ab plate will be free floating, but will be enough to keep your kidney even with the ab. If you have trouble with up and down movement you can always add another strip, this one glued to the ab, between the two strips glued to the kidney. Kind of like a finger join. I can post pictures later if you'd like to see what I mean.