Is there anywhere that does paired by direction with the fasts on the outside and island platforms at the minor stations? Seems like that would be the best - means you get to stand in the middle with a decent view of everything, and a local train can't block your view of the whole thing at once.
Also avoids the problem of a long walk between the platforms at local stations, and perhaps means less duplication of passenger facilities (you don't need to provide separate waiting shelters for each direction, for example).