many, if not most, of the complaints regarding the KUIU harness are about the fact that the pouch does not stay up when you take the binos out. I would be worried that the weight of the rf added to that would make that problem much much worse. I had the KUIU and put my RF on the side and could hardly stand it.. to each their own.
THere is no doubt that it will fit and ride nicely... it may just decrease functionality.
Joe