Thanks for the reply.
My TV track names are smaller because I set the two previously-mentioned initialization file parameters to 0 some time ago (makes the names smaller and not bold):
TVBoldStripNames=0
TVLargeStripNames=0
This can be done under Preferences > File > Initialization File.
I could try playing with Windows font configs, but first would like to see if there is a SONAR-specific solution, to avoid complications with other apps, etc.