AE is doing a lot of unwanted an unnecessary Adobe stuff ( for beginners) which is probably what happens on import or export.
Start with the project settings, check the “interpret footage” setting…try going a tif or SGI route and consider to get Neat for Resolve.
A slice of color…
Resolve 10.1.4 – Smoke 2015
Colorist / VFX / Aerial footage nerd
https://vimeo.com/saschahaber