Ted
I think TD has already answered this question similar to the way I would. That is, that there are two things that create uncertainty to the players, green speed and bunker sand.
The tour works very hard to give the players the same green speed week in and week out. This allows players to "groove" their putting strokes to a specified speed. When that changes, you hear the players grumbling. The most difficult thing you could do in that regard would be to actually change the speeds throughout the course during a round. Say, 6 at 11, 6 at 10 and 6 at 9, randomly during a round. This would force the player to be able to read which are which, and would really play with his mind. I know this is not going to happen, and is most likely totally unrealistic from a maintenance standpoint, but it would raise scores, imo.
Secondly, if the bunkers were not "so" perfect, the players would tend to not play as aggressively. I have been told by a top 10 ranked tour player, that the players are so good that you have to go pin hunting on most approaches from the fairway over bunkers in order to go low enough to have a chance to win. They just take their chance that they can get the sand shot up and in, if they don't succeed in their
approach. They count on being able to spin the ball out of the bunkers. If the lies are "random" enough that they can't always get a lie to spin the shot, they would be less apt to attack the tight pins. This would most likely raise winning scores over 4 rounds.
These guys are so good, that even these ideas might not really affect them much.
Taking the ball back to the balata ball we played in the mid 80's would do more than anything.