Erection Percentage When Jelqing

First off, apologies if this is covered somewhere else, I did a quick search to no avail.

Basically, I am hearing conflicting ideas about how full an erection you should have when jelqing, from around 75-80% to below 50%. Is this an ongoing debate, or do you increase %age with experience.

I’m just asking because I’m scared shitless about the venous leakage thing, and am taking it very steady.

The more erect you are, the easier it is to injure yourself. Stay below 50%.