Glad it works for you...
The 2-pass High Quality parameters come from forum member Fishman0919 (whose request triggered the creation of this plugin). According to him these settings give a better result than HCenc for lower bitrates (<= 3500).
If you use this mode for high bitrate conversions, you could maybe tweak some settings (the 2-pass commandline parameters are at the bottom of the script). My experience with tweaking ffmpeg is limited, you would have to test this for yourself.
Cheers
manolito