Interesting, and thank you for your article your PSA readings are very similar to my own. And they've only raised a couple of points in 20 years.
I found regular sex, or regular exercise increased the PSA reading by up to five points. So I always have three or four days relaxation before I go for a test these days. I came to the same conclusion as you, although in my case I've never had a scan. But I've had three biopsies over the years, which are not a pleasant experience.