.mkv exporting problems

[VHS_UK]

Do I get it right:

to get 50 fps you load your interlaced file in Hybrid, deinterlace it with QTGMC and save the file
to get 60 fps you load your interlaced file in Hybrid, deinterlace it with QTGMC and apply frame interpolation using InterFrame and save the file
(both without applying any additional filtering)

Correct. So InterFrame is the culprit for reducing the file size despite having more frames? I take it that isn't exactly a bad thing?

I somehow made one .mkv job with the same video down to 1GB but I can't remember how I done it, I posted the debug below based on the time it was created. (I have previously posted this debug output on here, where I thought it had no sound, when it actually did)