I completed my experiment.
Then, the setup changed to 2 counterweights - separated:
Next, the setup was changed to 2 counterweights - together:
The results: I could not identify a difference between the setups
- not better, and not worse.
I'm not sure what I was expecting (maybe better tracking?). So, I left it as the final setup with 2 counterweights together. Maybe I'll notice something over time.
I captured the LP playback for each setup as a digital file on my computer. I often "rip" LPs and have a pretty good process for that. So I was able to quickly switch between setups while listening with the digital files.