I have never gained from jelqs.
I did however get far better EQ when I was jelqing on a regular basis.
Now that you mention it. I did too. My EQ was better and my dick stayed straighter. I have developed a slight up curve. Not much. Just enough that I notice it. Maybe a couple mm over my entire length. I did notice that in semi erect state I hung out more. Completely flaccid I turn turtle regardless of jelqing.