The fact that you're doing this outside already tempers with your scale readings. The wind will impact for sure. And of course the quality of the scale: this kind of scale will never be precise enough for what you're trying to do. I work with precision scales, you need to calibrate them, use a flat and rigid surface, protect them from the wind, and have a piece of descent equipment in hand, otherwise, you'll obtain unreliable values.
Good video. I wonder if you would have more consistent readings with a different scale, like a 500g max one. But I've got my scale and I look forward to finding all the Fright Knights I can in the next few months!