In addition to the above— looking back at the entire time I’ve been PEing it seems I have made incremental increases in force applied, throughout the time I’ve been using tractive force to gain length.
I started out with a Penimaster and took some time to get it to it’s full force. It was about that time that I switched to the Bib-hanger, and started off hanging very light. I worked my way up to 3kg and stayed at 3kg for a month or so before taking a deconditioning break and resuming at 3kg.
So it’s possible that even if you can never hang more than 3kg you should still be looking to increase your weight incrementally.
So, my advice would be not to try to hang too heavy too soon, since you probably really don’t need to as long as you increase the weight a little at a time so as to maintain your ‘maximum rate of gain’
I’d estimate the basic maximum rate of gain to be about 1.5eighths of an inch per month— I really don’t think it’s possible to gain at a faster rate than this.
My personal maximum rate of gain is 1eighth of an inch per month (about 1mm a week).
If you can match those ‘maximum rate of gain’ figures at a lower weight, there’s really no point in trying to hang heavier— you’d just be causing yourself more problems, including inhibited gains (there’s an argument that suggests that hanging very heavy weights can cause the collagen in the structure to knit in a way that can stop growth entirely. Collagen can knit in a certain way that it becomes as strong as tensile steel (run a search on xenolith’s threads for more information on collagen and gains)).