Original poster's summary:
Thanks to everyone for your responses to my problem.
I have learned that good film drying to avoid curling is all about moisture control.
I hang my film in an upstairs shower to dry. Since heat rises, there is much less humidity on the second floor of my home. So, I ran the shower to create steam and humidity, hung my film then closed the door tight to somewhat seal the bathroom. When I returned three hours later, the film had dried with some but significantly LESS curl. It is now good enough to clear the scanner glass and no longer create Newton's rings on my .jpeg's.
In the same way I adjust the proper temperature of my developing solution, I will now begin to adjust the humidity of my film drying area.
It is usually the application of simple remedies that cut through the confusing details to solve the problem.
John near Seattle