Low compression high boost is not a lot of fun for a street car that is mainly driven out of boost. You will be better off for a street car to leave it the way it is and boost it because you will make more N/A power while in lag. What I can say from experience is leave it at the 9.5:1 and boost it you will definitely have a lot of fun.
Cliffs: Leave it the way it is and boost it.