Diagram
Okay, well… The green line is the direction and angle that you should be jelqing at, notice how you should start to curve your hand more the further you get down your dick. The red line is where you should stop the jelq, don’t go quite so far as normal, stop slightly before the glans. I don’t know why you should stop here but I seemed to get better results.
There is one vital part. This is quite a harsh movement if you are too erect, you should be slightly under semi erect and the resistance should be pretty much non existant for a while. If you are fighting against your dick then you will hinder the progress or make it worse. So just take your time and make this jelq stroke your natural technique.
Good luck and sorry I couldn’t explain it better.
Let me know if you understand it or not.