Thanks again to those responders. I have started a concerted testing effort. First test last night was to cut out the perineum area of padding from a moderately padded short. Using a moderately padded saddle, with a slimmer channel. No real change at 8 miles, numb penis. It did subside after a short break at my turn around. (and if i'm being completely open on this, testes are bluish/red when I get home. So to me, the problem is wherever the blood comes from to that area? I too have an slightly enlarged prostate (47yo), but dang this sucks. I love riding too much to quit!
Next test is same shorts but riding a different bike with a full carbon saddle (zero padding) and with a wide open channel.
For those requesting seated on bike photo, I'm so new on the forum, not allowed to post pics just yet. Silly rules.