This season, the Nats have been outhit .279 to .263 on the road, and outhit .246 to .237 at home. Pitching wise, the Nats ERA on the road was 4.24, while at home the Nats ERA is 3.41 (after being at around 2.90 prior to the All Star break) while their opponent's is at 3.55
RFK with its vast dimensions has been more a disadvantage than an advantage this season. If the fences would have been the width of the warning track closer to home plate, the Nats would have hit between 30 and 40 more HRs, while the other team, who so often always seemed to hit it *just* over the fence, would have hit between 25 and 30 more.
What gives a team an advantage at home, is how the players feel in their own house, the distance of the fences means squat, but those at RFK have worked on the players minds, and that's effected their game.
I agree, the sooner the Nats get out of RFK the better. In the meantime, to help the player's psychological game, bringing the fences in a bit would be a good thing short and long term.