If you change render scaling settings, make sure you shut down and restart the simulator to ensure those settings are applied. If you haven’t tried that yet, give it a go.
Render scaling has always been hit or miss with changes in the same gaming session, and sim restarts after changing render scaling settings are just as important as restarting after an update or adding items to the community folder. I personally do a full system restart any time I make a file system change like an update or addon.
I suspect the setting for render scaling is fetched on startup, and might be the reason you are not seeing a change.
If the restart doesn’t fix what you are seeing, contacting the devs may be the right next move.