I said previously that RQ IS Tour 1 is way to powerless racquet for him. But I am not sure that he is using RDS 001 (anyway he used a RDS001 paint job on SRD90). This one looks like RDS001 MP 2007 (the same as Nalbandian and Dementieva in 2007). That head size looks like 98, defenitely not like 90 he was using.well done Hewitt.
The switch back to the old racquet seems to be doing the trick.