I might use them for reference or to estimate tracks and kicks, but it's generally all down to feel. At one point I could use half a dozen systems well, pretty much always getting a hit, but it was too much to think about and threw me out of my rhythm. I basically now only use it with 3 rail route and it's parallels. Even that is limited usefulness with fly on the wall and parallel shift.
I just look at it now and hit it with much better results, barring something dumb like a 4 rail kick. To me personally it's better to keep my head out of the game as much as possible, that way I can perform and focus on actual strategy and the ebb and flow of the game.