I agree, I feel the racquet change was slightly too extreme. He seems to spray his forehand with the RF 97, like it has a little too much inherent power. He knows better than I do, he chose it... I would have thought a 95 with a thinner beam and softer flex would have been better for him.You can hit more successful halve volleys with the K90 than the RF97
My problem was always that he should have redesigned the K90 by
giving it 3 inches to 5 max not 7, it actually looks quite ridiculous
to see such a big head with his style and technique.
3 inches larger head and not the 21.5mm / 21.5mm / 21.5mm beam width
but 19mm / 19mm / 21mm like the Bridgestone x-blade 93 a real beast.