Hey - I'll give this a look tomorrow, but I have a few guesses in the meantime. My outline shader could be screwing up in a few different ways - either the outlines aren't rendering right with alpha, or it could be casting shadows it's not supposed to? Not sure what would be receiving the shadows, maybe something I'm overlooking with worldspace canvases?
I'll test it out tomorrow and get back with a solution ASAP! That title text is looking great btw, and this is really good info for me to use, thanks!