When jelqing at 70-90% erect that works length?

Or girth? I know I read somewhere that if you jelq at a certain percent erect it will give you length/girth? TIA

Approximately:

50-60% for length.
70-90% for girth.

People say jleqing at greater than semi erection is for girth. My theory for length gains while jelqing below 50% erection is that it effectively works like stretching. You are essentially pull the ligs with single hand jelqing when your cock is below 50% erection. Maybe the tunica is also stretched lengthwise by the blood pressure.

Maybe 50% erection jelqing will stretch the tunica lengthwise, while 80% will generate enough stress to stretch the tunica laterally. THough it fails me as to why 80% jelqing will also not stretch the tunica length wise…