You are making the assumption that higher weights = greater intensity. This may not necessarily be the case: it may be that the veteran hangers have simply finally figured out the technical aspects of hanging. To put it another way, they simply have learned out how to apply the weight in the most effective manner.
For the record, I have been doing PE many years, and only started manual PE in the last few months. All of my gains have come from pumping (mostly girth increase) and hanging (mostly length increase), combined with a cockring and traction wrapping.
I never thought about that, thanks.
How’s the manual PE going?