Thanks to all for the helpful feedback.
FWIW, I have 'banged around' a bit on my saddle and coerced a somewhat (small change) more rearward angle. But it just isn't at all clear to me that my 'effective saddle angle' is too far forward (see post #5
in this thread). I have moved it a tad rearward but ....
Anyway this is a virtual instant replay from the mid/late 1990's. Back then I was trying to return to good fitness and my running/marathoning heritage. I kept encountering ankle sprains, illiotibial band issues, etc. And an exercise bike was the alternative to running while I recovered from running injuries. After the 3rd event I decided "to hell with it - let's just be a biker".
So I bought I nice Bianchi from a local LBS and rode for a couple years. I entered 'biking' in reasonably good biking condition. And I quickly encountered 'hand numbness'. After a month or two it just kind of fixed itself. And interestingly that is EXACTLY where I am now. I have gotten my fitness back to reasonable on strictly an exercise bike. And a month or so ago I (and my local LBS) resurrected my Bianchi and I am back on the road (actually mixed road and exercise bike). Other than being much older it is an instant replay.
I have continued my research on this issue, considered and/or implemented the data suggested in this thread, etc. In particular the Numb Hands thread suggested previously is one that I encountered several weeks ago, and was really worth a revisit. But the truth is that I have been here before and this was a problem that mostly resolved itself.
So I have already made a minor change to my saddle angle, and am continuing to better focus on my hand positions and hand position changes during riding. Today I did a 'nothing special' 90 minute ride. My #1
focus was proper hand position and moving that hand position every couple of minutes. After 90 minutes I had encountered only minor hand numbness. This is a HUGE improvement over previous experiences. So I am hopeful that continued focus on such things will resolve this problem.
If not my current handlebar height is 3.25" below the nose of my saddle. I would think that raising the handlebars is the next step. And beyond that is a full professional bicycle fitting. But today's ride was most encouraging.
ps. Just for grins here is a general pic of my bike - not so helpful as one with me on it. But since I had the pic ....