Just tried this, and it works if real-time is off with any render resolution, so it’s a step in the right direction for my issue. But as soon as I enable real-time, the sharpening disappears. When render resolution is set to 100, it works great.
Edit: nevermind, I got it working, I’m just stupid 
I really need to spend a few weeks digging into HLSL and custom material expressions. Thanks for the help
S marrocco.