Here's what I'm doing.... If need be, I can record it and show you, in case I'm missing something here.
1. Click on rounds.
2. Switch the 150/300 to 100/200 (due to change a few seasons ago).
3. Click Save Template.
4. Copy file path (as explained initially)
5. Over-write MikeRounds file.
6. Go to preference tab & Click Config File.
7. Paste the path, typing in MikeRounds file (with extension).
8. "OK" out to main screen, and exit program.
9. Restart program, click on rounds, see 150/300.