I used to shoot 4x3 parobilics with a high FOC arrow out of a 47@28 checkmate hunter 2 and they flew great! the 4 3" feathers I thought were much less affected by cross winds which was nice.
I am back shooting 3 5" shields and because I just like the look of the feather better. back a few years ago I fletched up a few arrows all with the same grain arrow and went out and shot... Pretty surprised how much better the 4x3" shot in cross winds. The 3x5" were the worst by far. this was on a very windy day shooting outside so there are lots of varibles, but I still feel like the 4x3 is a killer feather choice. It was also quiter in flight.
good luck.
Levi