Perhaps I should've said the goal was not to gain but rather his SKF training. I stand by statement that after a certain point your tissues in your penis respond by toughening instead of elongating and chance for injury increases. To me the choice is clear.
He got most of his hanging gains from what I would consider heavy 20 to 40 lbs, after newbie gains where he stretched and jelqed in a hot tub that allowed heat past 40 degrees Celsius. He also modified his hardcore bib to allow long sets without circulation issues, ADS'ed with his cock coils, made experimental girth contraptions [cock coffin and nice vice] (and yes they work!) and really was one of the first to employ rest and really emphasize it in his workouts. He really was a pioneer and a genius and his own routines evolved as he collected more in formation from his previous campaigns. However when he got to extremely high weights 80 to 100 his gains stagnated and that's about the time he started to really develop his later routines and gizmos like the Tiger Trap (TT) & tunica tenderizer (TTr). Later routines took him from 8.5 to 8.625 to his final 9.325 BPEL
At the foundation was attack the tissues very aggressively if needed, back off and let rest and repair work. I'm currently experimenting with a modified, in light of new info, and toned down version. So far around 0.5 inch gain in BPEL in one month that as of 3 week's into decon has not lost even a 0.1 cm. Though around 1/4 inch was reclamation of lost gains the 20 months before that.
I hope you get the gains you are seeking. I'd recommend heat the first half of your sets and if you plateau rest. DLD hung with very heavy weights for a time too.
