Yes, I agree.
Bit hard to see in the picture, but since adding the disc / plane in the evening of Feb.27th, I get a better Signal to Noise Ratio, compared to the earlier five days.
The distance between “Weakest” (blue) and “Noise” (green) has also been good at some earlier nights, but since the disc noise is always far below weakest in the night and less stronger than weakest in the days.
So I would say, this disc is a slight improvement for the Ten-90-clone. Perhaps it will only work well on the clone. Perhaps because by change it get placed at nearly one wavelength below the feeding point or similar. Perhaps because the disc is working as a reflector at - by chance - good distance. Who knows.