Just went through this. Measured @.050" open and close. Also C/L @ .070", .050", .030" before max lift. None are quite the same. In fact duration was longer than the card showed. The bottom line is advance it further than you'll ever need and check intake P to V. Retard it to far and measure exhaust P to V. Then stab it in close to where you think it should be, by whatever method you chose. Then when it's up and running you can move it with confidence. You'll never no what's best unless you try different spots.
Doug