Yep, the image recognition part is definitely the trickiest to perfect. I'm actually working on a complete test-bed behind the scenes, which should over time improve the OCR across the board, and potentially push forward a fullscreen solution! :)
Yep, that's on me, haha. I had an unintuitive and bad setup. I hope the recent update made it easier for you to test things out. The next update will make it possible to change these values from the dashboard in the tool too, and more improvements like that are on its way.