Colour appears faded and wrong in After Effects, how can I match original?

I've read lots of help topics trying to solve this and can't. I regularly get videos to edit or add subtitles to supplied as a .mov file, but within After Effects and when I export it looks faded like I've added a filter. I often don't notice this until the client comments, and then have to add Lumetri filters, and there's never one approach that will solve it (it starts to look to yellow or too pink when I just increase the contrast and saturation), so it can take a long time to fix. My Project Color Setting is 'None', I've tried a few others and all look worse. What can I do to avoid this happening, or solve it every time? 

The screenshot shows how it looks in Preview, and it looks ovbiously faded and dull in After Effects. This is before any edits. Sometimes (like this case) there are sections with white copy, so I don't have the ability to add a tint as that makes the copy the wrong colour.