So, I’m just coming back to this after a few days and I don’t think it was working as I thought it was.
Video of issue:
Reticle Setup - as you can see from the vid it appears to be going to 0,0 on the 1920x1080 canvas. Same thing if the reticle image inside the canvas is at 0,0 OR in the center:
Since I am rendering the reticle on primary fire, (center down 30) I just set my widget variable here:
And calling into play here according to your example above:
While my cursor isn’t moving around on screen like yours, it is off center so there is something in that mix that isn’t working correctly. Thought I would try you one more time 
Edit #1 For the record for anyone looking at this post, the reason I want to use the reticle as the endpoint, rather than a hardcoded setup like this:
…is that it becomes extremely inaccurate the closer the hit is to the start point, as you can see here:
Edit #2 I feel like I’m realllly close with this setup:
