Well my original guide still stands, it is entirely prototypical and will still work providing the timing isn’t precise. Also, it would be particularly difficult (however, not impossible) to know the exact centre of your rail line, which would naturally set the trains into a standardised uniform rhythm. Offsetting the loops a metre off centre in either direction would solve the issue and create non-uniform timing – if you wish, you can check my math using your own equations.
However, the entire point is moot since the issue will be entirely resolved as soon as I get my hands on the game, assuming of course we can mod the signals.