You aren`t going to be able to do anything for abs. Boyer Coe had the same issue. Abs are genetic. You can make them bigger and thicker, but this in turn will make them appear less razor sharp like and will obscure the lines.
Alot of the pros have fucked their abs up by using Growth Hormone and Insulin...Their abs and obliques keep growing obscuring nice clean razor abs. I have never seen a natural with awful abs really.