I’m also just guessing that it might be possible that a Cam v4 would give better results because I think it’s got a better processor and is working with more pixels in the image. I wondered if frame rate would figure into it because of the hummingbirds’ speed, but Cam v4 and Cam OG are listed with the same rates. Based on the photo you shared, I would guess that distance is a major factor in your results.
Thank you for sharing the photo, by the way! Things like that are really helpful for understanding your problem. 
I think you’re doing the right things with settings. What you’re describing makes me think of a recent experience with rabbits and a planter hanging off my mom’s front porch. When I saw that a rabbit was building a nest in the planter, I decided to put a spare Cam OG out there and mount it a few feet away to monitor the location, but I wasn’t getting Pet notifications until I adjusted MOTION DETECTION SENSITIVITY, which I set to 80, and that’s on a larger and slower-moving target.
When I think about a Wyze Cam setup to capture hummingbirds, this with a Cam v4 and extra lenses is what comes to mind. The additional lenses really help, I think, but the camera itself is also considerably closer to the feeder than what you’re showing, so something like that might be a consideration if you can still achieve your æsthetic goal and not hamper foot traffic.
Welcome to the Forum, @blackthorn.roads! 