Well, I did try that before several times and then have decided to report on what I've found.
Changing LogPixels under HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontDPI had no effect (even after a system restart).
Changing LogPixels under HKCU\Control Panel\Desktop had immediate effect for the user after logging off and logging back in (a restart was not required).
Also, changing the text size via Option 1 in the tutorial created/changed the LogPixels under HKCU\Control Panel\Desktop.
Now, all my tests have been tested on domain computers, so I'm not sure if that made a difference. I currently have LogPixels under HKCU\Control Panel\Desktop enforced in a group policy, so all computers in the domain would have the same DPI value set.
Here are two supporting threads (if you don't mind me posting offsite links)... c# - Screen Text size in .NET - Stack Overflow how to change the windows DPI settings programmatically?