After Effects Render Issue

I've been using After Effects for about 5-6 years now, but I only started facing this problem very recently. Essentially, the colors on my After Effects projects become washed out post-rendering, though it looks fine in the project file.

Now I know a post discussing this issue already exists, and that this is a very common problem, with typically a quick-fix, however, I have tried to re-interpret the footage, change the bit-depth and color engine settings, enabled and disabled color management, altered my render settings to match my output, and tried various Working Color Space settings, including ones that match my footage and correct the coloring while in the project file, but as soon as I render, it automatically washes out the colors, and increases the exposure dramatically. 

I contacted an Adobe After Effects agent via the help tab on the Creative Cloud app, who described himself as a "Adobe After Effects expert", however after taking control of my monitor, he essentially did the same thing that I did, only using Adobe Media Encoder instead of After Effects' built-in render que, and insisted that he had fixed the issue, when the resulting render was still high in exposure, and low in color. 

I am a graphic design/video editing freelancer and contractor, and I need to be able to get projects done quickly and maintain consistent coloring thoroughout the content a client gives me, without resorting to messing around with various effects on an adjustment layer until I maybe get a close match.

Anyone struggling with something similar?