Anecdotally, I've noticed that the F train is "often" (~70% of the time?) waiting across from the downtown A at Jay St between 6pm and 8pm.
I can't seem to find any official MTA information on coordinations like this. The A and F schedules are both in the "every 6 to 8 minute" frequency during that time, so can't compare even scheduled times.
Is there anywhere the MTA publishes these as a deliberate objective (to allow two trains to exchange passengers)?