But by looking at your SS I can see you mistook what I said about it being 1080p. You have to make a distortion of your clean plate to make itself 1080p. Standart corner pin data/usage transformes a 1080p plane into the pins position. copy and paste that corner pin to a 1080p solid and you'll understand what I mean.
You can also use the "Align Surface" workflow in Mocha to set your tracked surface to be the full frame. This allows you to create your clean frame at the full frame resolution in context to the frame you want to paint.
This video covers the general workflow. Even though this covers the Insert Module workflow, the same workflow will work with Mocha AE and corner pins.