I think Peat himself said ashwaganda was serotonergic, (I know you said you aren’t currently taking it). The porn and masturbation are for sure causing issues, but the issue isnt so much that you’re engaging in that, (without end-point gratification mind you-which is a whole separate issue potentially) but rather porn and masturbation are a symptom, (again, like the meticulous logging of food and supplements) of what seems, (to me) sky high serotonin. You are trying to control everything in your life, (down to denying yourself ejaculation because of a potential negative outcome).
This is not what you want to hear, but if you’re not having fun playing soccer you should quit. It sounds like your life is totally devoid of joy. I don’t say this lightly, I say it as someone who had a similar experience playing competitive sports. I now wish I never played sports, and believe strongly that my time spent playing them caused most of the health issues I have today, (but more so, my playing sports in the first place was a symptom itself of my lack of energetic living). I hope you find your happiness, whatever that is for you. I have, and it took me til I was about 40. I hope you don’t have to wait so long. Be well.