What altitude are you at? Can you post a better picture?
At first glance the dyno graph looks good and you shouldn't expect high numbers on a mustang dyno. Your numbers are close to what they should be. Can they be better? Yes but it depends on so many things. The important thing is how does it drive and feel? Is it an improvement over stock? Run it at the track once and see what it does in the 1/4 mile. This is usually what holds weight to me. Dyno graphs really mean nothing in the real world.
George.