Though both have switched to smaller heads and thinner beams both still make as many errors as they did when wielding oversized head/thicker beam frames. I wonder if they still use natural gut. Perhaps the string is just too powerful for them. Perhaps a hybrid stringing with luxilon or pro hurricane would give them the control they need to make fewer errors. It's a thought anyway. What do you think regarding this racquet change- still too much power or do you notice any improvement?