Hi

The first thing I would check is your Antialiasing settings - if they are high enough to smooth those jagged edges and try different filters.

If that doesn't help it might be some issue with color clamping - I would try to turn on/off "Subpixel clamp" option and play with it's value. Also color clamping in Frame Buffer can sometimes give such an effect.

Hi

I think you can save the V-Ray settings as a .vrayopt file and then load it to the scenes.

Also, when you export the scene as .vrayscene it is just a text file where you can edit the options in any text editor able to handle large files like Notepad++ or EmEditor. They have options to rename the parts of the text as a batch.