I gave DTA a call who recommended Rick Wood who has done a lot with the VVT. The S60 ecu allows full control of the solenoid and pulley so I can do it by degree if I wanted. Also the pulley moves 30 degrees as it goes by 60 degrees off the crank. So as you say, with the pulley being adjustable I could have the full 30 degrees of movement stopping at the point where it makes peak power