One thing the article doesn't point out is that your pinion angle should be 2* less than what you need to zero out. The reason for this is that undo torque (driving conditions) your pinion will rotate up roughly 2*, more under hard accel, less in coast or braking, but constant drive torque is 2*. So if your trans is down 3* you need pinion up 3* in driving conditions to cancel out the angle. In this example I would set my pinion at 1* up knowing that under driving conditions it will twist up 2* for the total of 3* needed for minimum vibration.