These sources use to change "field dominance" irregularly and steplessly. With "field dominance" I meant which of the two fields is displaced. While changing the "dominance" fields are blended.
I did some corrections of such sources by hand, in a simliar way, hello-hello did, but gave it up - doable, but not with a whole series, because it changes every few seconds. (My record was a six-part-series
)
Again:
SRestore with frate=25 gives reasonable results. - Try it, or buy NTSC.