No more red dots

Before when I used to jelq, I would get the red dots on my head from jelqing at strong intensity. I largely contributed those to most of my gains in the previous months.

Recently when I jelq, I almost rarely get them anymore. I’ve had long breaks recently as well, and when I started again, I still didn’t get the red dots again.

I’m thinking I should up my intensity, but it scares me from potentially causing injuries. My theory was when those happened, my dick was rebuilding stronger (and bigger :D ). But maybe now it’s too strong and conditioned?