Restoring badly digitized VHS

[Graven]

Any thoughts why this may be?

No, no clue what the characteristics of the ffv1 file the first call outputs are.

Here's the process on a smaller clip, I prefer the output here after the fields are stabilized and woven back to interlaced.  I'm surprised I can't duplicate this using a pure VS script (mostly suspicious of my lack of 
understanding here, not VS).

https://ln5.sync.com/dl/1cce6c470#5ck9r5...j-kgnb327u