Is there any way you could please give us the option of using just a simple cross consisting of two burned lines for the target used in each of the four positions? The current alternating “quarter sections” can be hard to interpret due to the relatively limited resolution of the cameras. Everything is pixelated when you zoom in close. At least with a line you can try to click in the middle of the pixel blob. When you have a dark “quarter,” it is harder to determine a center-line.
I had tried both ways and decided this was better. If it’s just lines, they can be very hard to see. Just “aim for the middle” - And you can always go retry if necessary. If the resolution is that low that you’re having trouble discerning where the middle is, it’s likely too low to be accurate when using it.