Constant tightening of pelvis floor

Hi
mid-20'es male who have been suffering from PE (entire life) and ED after around 10 years of heavy porn usage.

So i have been doing normal mode for about 5 months now and seen some great results in regards to my ED. However there is a lot of variation in how long i last. Some times i bust after 10 seconds with almost no control, and no "cooling" effect of stopping and going down on her - like if my arousal just stays at 9. At other times i can last for almost as long as i want, as i am in full control of the arousal.

Ive noticed that there seems to be a lot of reflex contractions in my pelvis (both during sex and in everyday activities like walking the stairs) and was wondering whether anybody else have experienced the same, and tried to consciously relax the pelvis floor as much as possible during the day (any time you notice it tensing up a bit), and whether this helped them in regards to PE

Cheers