Video compression is about compromise. You can have high quality OR small files…not both.
The best quality setting (using premiere) would be 7.8 mbps (video) , but that would require 3 discs and take your total bitrate to 9 mbps which is higher than most folks would take duplicated discs.
Using Encore or Premiere Elements with Dolby audio could take your video bitrate up to 6 mbps which is 1.2 mbps higher than Premiere for 2 discs.
https://www.video2stream.com