I used to use the Surge for over a year, and i also had demoed the pure drive. you really need to have extreme topspin with these racquets because i compare them to a trampoline. others that have used these have used lead tape or extremely high tensions to harness them.
I did eventually what i have done before, switch to something more advanced....because really what they are, are high priced game improvement racquets when many advanced players try to force these to work for them because roddick and moya use them etc.
Just my 2 cents