Federer holds the racket on the same side every time. Below are the pictures showing that the tension sticker is always at the top of the throat on backhand and forehand strokes with the new black RF97A. I checked around 50 close-up pictures of Fed holding the new black color RF97A the same way all the time. It can be seen from the previous red-black color version of the RF97A as well. When he was using the asymmetric colored 90 sq inch. BLX, this was quite obvious that he was holding the racket on the same side every time. This is most probably related to the custom grip mold. If he is doing it same time in a tournament, this cannot be a random sticker placement issue from the customization department. I believe that they want the rackets to be the exact same, therefore customization/stringer guys will place the sticker same side all the time at least in a tournament. As you can see in the pictures below, one hint is that on the same side of the sticker at the bottom of the V shape, there is a square logo visible in all the four pictures below indicating that the stickers are placed on the same side of the throat above the square white color logo. Also, the the tip of the W stencil logo having three noses show basically the sticker placement side.