If it is not the food many cats get an esophagus problem which my cat who is 16 has, well did for many years until I learned what to do. It would seem unusual that both your cats have it but then I don't know what causes it. Get their bowls up higher that they eat from seems to be the biggest help, I also use Hartz hairball remedy but usually forget, but not a bad idea when I can remember. Elevating the food and your cats position eating seems the answer if it is esophagus. Another thing I do is give my cat less food first thing of the morning, since hunger could cause her to eat too much too fast. I can't remember the last time she had a problem after years of this so I know for her it was the answer. Good luck.