Good question, I feel for accuracy that perhaps measuring the bend is more precise, however my experience has been that jelking straightens the bend this is what happen to me my erections are strait now instead of slightly bent. It use to bend toward the right at about a 20 degre angle.
Is this your starting size, great size you are already big, according to penissurvey you are well endowed. Approximately 10% of the world male population exceeds you length and girth. Thats only about 280 million dudes out of nearly three billion, providing the survey reflects a cross section of world population. I think only 3500 people submitted measurements.