A big thank you to all my topic responders...
- Dale:  How to write a Column Formula for percent of total
- Jim:  Info about Graph Builder labeling (non)functionality
- Kevin:  A good laugh
While Dale's stacked bar chart suggestion was interesting, I couldn't use it since I've been tasked with creating dozens of scorecards -- each with its own pie chart and other metrics.
I ended up using a rounded percent (via Column Formula) and applying "Label by Value" to the pie chart. Here are updated graphs for A & D:

While it would be nice to display a percent "%" sign, the percent numbers now show completely.  Cheers!
JB