Even with the changes suggested above, the file sizes on Standard (previous High Quality) are still about 2 Gb larger than before. Is the quality better or the copy better? The new Fast setting seems to be the old file size but is it less quality than before?
HartS2k
Normally, the larger the file, the better the quality.
Please take screenshot of the output playback to show us how it's "less quality than before".
In this case, please specify the last movie you try and send us the dvdfab_internal log file to help check the issue.
We will also a mediainfo result of the output file. Thanks in advance.