So picking out the science mumbo jumbo, here's a bottom liner.
When you select a lane ring, a small bracket will appear in the center of the ring that accords for the whole ring. Ever done pythagoras theorem? No? Well the idea is, if your facing the lane ring directly on the stellar plane. And you take a shot at the bracketed area, everything should be hunky dory and working properly. However, if you fancy your chances at shooting....say the bottom left ring component from the same point. The shot has to travel in depth as well as in length. So naturally, if you think about it, it's going to take longer for the shot to reach the target.
But scoot forward a bit and the shot should land nicely.