Media Encoder Washed Out Colour

Hi, I was wondering if anyone could enlighten me why media encoder washes out the colours of your compostions? I know this has been a well discussed topic within forums but none of the solutions seem to be working for me. Any help would be appriciated!

You can tell with the example below - 'left' being inside of AE and 'right' being the exported comp. The colours just aren't the same and its really tricky to find out why.

Again, any feedback or tips would be really helpful, thank you!