I have been suffering with Achilles tendonitis off and on for the past year and a half. I am a4.0 player, 50+ and play doubles once a week on concrete. I have been wearing K Swiss Defier for a few years. They must have changed things since I have not been happy with the past pair I have gotten. With my achilles issues, I am looking at getting a new pair of sneakers. It there anyone who has had achilles issues and would recommend tennis sneakers for me to wear? Thanks!