Well it depends tho. Sure i would NEVER underestimate how useful 4cp is, every crafter knows the pain of being 1cp short on something ... BUT that extra craftsmanship and control is more useful if it allows you to achieve a better rotation.

again here http://forum.square-enix.com/ffxiv/t...fting-Rotation

Thing is with rotations these days it's easier to tell exactly how much CP you need. Balance up the rotations you can achieve and the different variables.