Thanks. I actually didn’t duplicate frames… At least intentionally. Which do you mean specifically? I trimmed some from between reels to keep it in sync with the audio but don’t remember doing anything beyond that.
For cleanup, Multiple passes of Neat Video. The initial done in virtualdub to remove only the chroma blotches. Prior to this i also applied vdubs chroma smoother for 4:1:1 video.
The second done in premiere was a full dnr + some sharpening. I overlayed the original video over the top with an opacity of 27% to add back details without adding back all the noise.