I''ll say this regarding this comment. Most reps don't have a clue about what they are talking about. Most. Not all. But I digress.
As far as what I can tell, been told, seen, and felt, the retail RF97 is the same frame Fed uses, minus the custom handle, lead added, string he uses, tension, over-grip, power pads, and stencil.Sorry for being long-winded, but want to make sure I cover all the potential arguments that could possibly come from me "failing" to provide every aspect.
Additionally, Fed has lead added to his frames, which should end any debate as to whether his frames have special "anything". If they were so custom for him, and we get leftovers, then wouldn't wilson have simply made the frame to his exact specs?? and exactly how he wants them weighted? And also, if you look for pictures provided by P1, you could clearly see that some have a little bit more lead than others, which means they are slightly off from one-another. If you look for posts from Ron, you will find that they do this, to make all his frames identical.
And NO, this is not a quality control issue from Wilson. P1 does this for every player they have, including head, babolat, prince, yonex, dunlop, etc.
Hope this helps.