This could be a mild version of pyronie's disease which is a thickening as scarring of the inner tissues of the penis.
It could be a venous leak, which would make it difficult to maintain an erection.
Pyronie's is treated with calcium channel blocker, vitamin E, injections, sometimes surgery.
A venous leak could be identified by ultrasound.
There are other things that can affect erectile function:
high blood pressure
I would again push to see the urologist...emphasize the ED and this ought to be justification.
let me know if you have further questions
Discuss these issues with your gp as well.
You may Always ask from clarification as needed, even after you Click Accept to give answer credit so I am compensated for time and expertise. Come back if needed. Bonuses and positive feedback most helpful. Answers for informational purposes only, not to replace your physician advice or visit.