Looking at the specs, the AS is slightly less stiff, and the string pattern for the APC is 16X19 while the AS is 16X20. Also, the beam width for the APC is 20 mm Head / 22 mm Shaft while the AS is 21 mm Head / 19 mm Shaft. TW says that the power for the APC is low-medium and the power for the AS is low. Has anyone hit with both? Are they practically the same racket except the AS has cortex?