I just made a video with the build that i did yesterday with the kingkong 40mm props, you can see it right below these comments.
Those are the first props that i try with this build. In fact, i don't have any other props that would fit this quad without changing motors or frame. I also want to try the micro 8520 with these props, just for comparison with the hubsan and ladybird props that i already tested. I guess that props have a lot of influence in the flight characteristics. The long 2 bladed props in a micro 8520 make the quad powerful but less responsive and very drifty. In this case, with 3 shorter blades, the kingkong props fly much more like a tiny whoop, very agile and less drifty. Besides that, I think they are the most quiet props that i have. I like them a lot, but i have to keep experimenting and testing.