I did a research on penile reconstruction surgery and I think I have an idea of where the limit is.
Along with dorsal veins there is the dorsal nerve, which is responsible for the sensitiveness of the glans and blood valve control.
In this kind of surgery, the doctor replaces the tunica, or does some kind of little cuts there so he can stretch the penis till its limits which is the dorsal nerve max length. The average gains in this kind of surgery is a little bit more than an inch (3.2cm). Of course, this surgery requires an implant for penis to work..
If you are forcing your dorsal nerve, you may have some results, but it’s far more dangerous than stretching the tunica. Risking bad EQ or even an ED.
I believe that some guys just have more room to grow than others. When I stretch my flaccid penis till the limit, it stops because of dorsal nerve, this “cord”. My tunica remains very flaccid. I truly believe that, in cases like mine, length gains are far more difficult.
That may explains why the gains become harder over time.
What do you think?