One interesting thing about the Technidisc SWE is that it has baked-in rainbowing. That is, it has rainbowing baked-in to the master that can't be removed via the phase inversion that comb filters rely on.
A good example of baked-in rainbowing is on the Star Trek The Next Generation DVDs. No comb filter can eliminate them. They're part of the signal.
With that being said, prior to changing to my new LD capture setup (Pioneer LD-V8000 to an ADV7842 evaluation board), I captured all of my Technidisc SWE copies with my existing setup (Runco LJR-II to Leitch DPS-575) since a more advanced comb filter wouldn't help anyway and the Runco's undefeatable noise reduction does a really good job on its baked-in crosstalk.
Our best bet to remove the rainbowing from the Technidisc SWE is to low-pass filter the chroma. There's not a whole lot of effective chroma resolution in it anyway, so we don't lose much.
It's also worthwhile to note that almost all Technidisc pressings (including many other movies on LD) suffer from crosstalk and, as many LDDbers describe it, "chroma noise" which is the baked-in rainbowing I'm seeing, I suspect.