How to Export ProRes as sRGB to Maintain Hex Color Values?

Hello, 

I'm sure there's been discussion on this, but I am at my wits' end trying to get accurate colors in motion graphics for use on a web page. My goal is to set hexidecimal colors in AE, and achieve those same colors in the export file. But I can't seem to get the file to come out without Rec. 709 curve adjusting (I think)? 

 Color test export results. 

I have:

• Project Settings: Working Color Space: set to sRGB IEC61966-2.1
• Output Color Space: set to the Working Color Space

See project/render/output settings below.

My current work around is just basically guessing/calculating a different hex value that, when color transformed upon export, results in the desired hex. Not a great long term solution. 

Surely with these settings the color should come out of AE as the hex code they're set as? Or am I missing something? Any help is greatly appreciated, thank you. 

I don't want to muddy the water, but additional info:
I'm trying to render ProRes 422 HQ .mov as a master file then transcoding to H.264 .mp4 with Handbrake for small web file sizes. But I did confirm the color transform is from the ProRes file.