Both I and my brother, would stand as proof that your Doc could have a flawed attitude.
Neither had ANY symptoms.
Neither had anything to show via the DRE. ( Totally Normal feel )
Both had G7 cancers.
The Bro would have been dismissed to "Watch and Wait", except that I had already been cut !
When the DRE Doc heard that I had been cut, he dismissed caution and demanded a biopsy.
BUT - this is not quite the same issue as you are asking !
"My doctor instists on this (DRE) and says that if anything starts growing he will be able to feel it. "
I would think that the only thing that would be feeling after an RP, would be the sharp pricks from all the bloody surgical clips.. Gee they annoy at times !
"I told him that if the cancer has grown big enough to be felt my psa would be off the charts."
I would agree with that suggestion, and especially with your having the "Zero-Club Membership".
I think your Doc loves you ! .. . HeHe ! ..
.