Beenie169,
I have little advice about manual stretching. However, I think since the time spent stretching is much less than an ADS the thought is that you have to pull harder. During my stint with manual stretching I stretched my dick until I reached a length that, even if I pulled much harder, I would not increase much past. That corresponded to a little (less than half an inch) over my NBPEL.
I have a penismaster (though I use the modified VacExtender head for attachment, those straps are murder!) and if I recall they recommended (based on their “studies”) that you use ~6-8 N of force. Now all dicks are different, but for me that corresponds to roughly stretching (as measured from the top of the base) to my NBPEL. However, even though I don’t have much of a fat pad, the base does sink in roughly a quarter of an inch.
But remember, listen to your dick and how it responds after the stretching (read the positive/negative indicators thread if you haven’t already) - if your erections are stronger/more frequent and/or your flaccid hang is much bigger, then I would keep it at that stretch level for at least a month and see what happens.
Unfortunately, I am a hideously slow gainer so I have no good results to share.