I’m always a bit surprised that Vekoma’s boomerangs don’t get this close to the end of the spike, because it’s surely something that can be calculated pretty accurately, with a margin of error based on the changing occupancy weight of the train. If you wanted to over-engineer it, you could weigh the train, Duelling Dragons-style, and adjust the speed of the mid-course launch accordingly to ensure the train always reached the same point of the spike.