Straight up man, I’d go back to basics if I were you.
You’re really not doing a lot of PE as it is and if it’s effecting your erections, you may need to adjust your technique. Which direction are the stretches in? What kind of stretches are they(straight, fulcrum, reverse)? Roughly what percent erect do you jelq? It’s better to do this with a ‘full’ yet ‘spongy’ penis. That is to say you want as much volume in your penis as possible when jelqing without letting the cc or cs get hard. It should be soft, and spongy. Like a sponge, for example.
I am really with Mem in the camp that says jelqing is a kind of art, a very intensive process to learn that should be constantly monitored. I usually check my technique every 30 days or so to make sure everything is as it should be. Are you doing wet or dry jelqs? Have you thought about breaking your jelqing up into strokes? Are you kegeling in blood before every stroke? Have you considered a routine of pure jelqing for maybe 30-60 days just to condition your penis? Yes, I know I’m being a probing bastard but the more info you give me the more I can help you out with this.