It is my understanding that he played the APDO stock until 2011 or 2012, when he added a few grams at 12 and handle to help him beat Djokovic (he been losing to him a lot around this time). He gradually added more and Tennisnerd has his spec at 340g 360SW with 12g under the bumper and 5g in the handle. Having tried this setup, it swings extremely fast.
No idea what his specs were with the Pure Drive, but I'd guess they were close to stock. There's no way he would have decreased SW when switching to the ADPO.