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Have you got any underlying health issues?
Its seems like peyronies disease. The erection seems to be good quality. With 30% you should be able to have vaginal penetration. Doppler USS is not a very reliable investigation to diagnose ED. It most of times shows venous leak which now is considered not very significant. ESWL is a treatment for peyronies disease ( recommended by NICE guidelines ). In my opinion should use tab Cialis 5 mg OD or 20 mg Twice weekly and the ED would improve. Does not need any corrective surgery for 30% curvature. ESWL is optional.
Anything else I can help with?
How's your libido
I don't think testosterone is the cause . Its low but not that low low to cause these symptoms. However you can take a shot if testosterone depot preparation given intramuscular and effective for a month and see the response to it. It will need a prescription from the GP. If you find that it has worked then can continue it.
It sounds multifactorial...Vascular, peyronies, testo to some extent and psychological