Ok, but its not revolutionary stuff, your jelqing sounds pretty effective and not without saying this.
**Jelqing in this manner can cause serious damage**.
No refunds ;)
There are basically 3 factors in jelqing that I can see. Of these the grip is probably the most important. The other two are erection level and the stroke.
I find a 3 second stroke works best. I still count 1 one thousand, 2 one thousand 3 one thousand. Anything more than a four second stroke does not seem too effective, this is related to my current length and my idea of a second is probably, in reality, over a second. The stroke in combination with the grip needs to exert a significant pull. This pull is easier at lower erection levels but quite possible at higher erection levels.
The erection level I use is 90%+, this runs against the maxim for length gains but I find it works for me (and I did work up to that). Also I do a pretty major stretch routine so I can only vouch for it working in that kind of routine and of course its only personal experience.
The grip placement is important, using a full ok is not essential (though I mostly do), what is essential is the rotation of the grip. When jelqing up I i generally rotate the grip out slightly from what is comfortable as I find I can gain more purchase on the ligaments and better veins closure with a lower pressure. I often locate the thumb joint over the dorsal nerve. The pressure I use is probably best described as slightly under tourniquet, it has to be pretty hard with a high erection. When jelqing down with an overhand ok (I tend to switch as my erection starts to fade) I again rotate my grip but this time its more often more inward than is comfortable. Sometimes I close off the bottom of the shaft sometimes I don’t.
The ok I make is with the thumb over the finger. This allows more pressure, simpler variation of pressure where necessary and (when jelqing with a standard ok) the production of a grip that leads at the top when I want it to, producing a diagonal area of pressure.
Because I have a foreskin I tend to finish one stroke and hold at side of the glans, attach a light second grip about 1.5” up release the top grip enough to pull back the skin to the base (which is not much with KY liquid).
So each stroke I’m focusing on several factors, how much of a stretch I’m getting, the pressure I’m creating ahead of the grip, the pressure I’m creating in the head, the proximity to and pressure on the dorsal nerve. I stroke full way up to the glans but I’m extremely aware of what I’m pressing on and I release pressure a little when I hit the glans and any remaining pressure is sideways which runs nicely into pulling back the skin again.
I only ever jelq for 15 minutes as I simply cannot concentrate on and create the same intensity over a longer period. I work up the intensity within the first minute or so and by the end of that minute it is extremely intense. I kegel hard with each stroke prior to tightening the new grip at the base. I do 1 - 2 sessions a day (currently mostly one) spaced at least 4 hours apart.
Recently I was forced to jelq one handed and I found pumping and holding the PC whilst reasserting the grip at the base worked pretty well.
I don’t recommend that you go for this method. Try taking bits and pieces if they are useful, and experimenting with the grip is probably the most important thing. Is that the kind of info you wanted?