I didn't increase the shutter speed because my main light would have created flicker, and initially I thought that might be cause, but as I work on more and more shots it seems it's on the image capture itself. The nastiest part is that there's a "bleeding" on the key whenever the background-tracking marks come close to touching my subjects. I think it will look well in the end, but not as well as if I had shot 4K to begin with, and with a lot more manual work than I would like,
Those tracking marks need to be masked away separately. Usually people have a separate key for different areas of the image (hair, hard outlines, soft outlines) but I've been having good success with Keylight using only one pass of Keylight itself (only using the intermediate result tab, not the final one - final result strips away color info), which I then spool into the different matte tools in AE (soft matte, hard matte fixes, color cast fixes) which I do separately instead of using Keylight. AE CC has pretty good additional matte cleaners, some of which can generate motion blur into the key itself too. Making the key sharper is just making sure the contrast values for alpha edges are on point.
I really doubt your soft matte is an issue of low res.
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