I know the specs that is advertised is not same and accurate for all rackets for each company. for example Head rackets can vary up to 0.2-0.3 ounces from each frame to frame. Also HL balance isn't the same for all rackets. and same is true for Babolat and wilson. Exactly how much can the specs vary from frame to frame on Weight and balances. ?? and which company is the Worst and which company is the Best(meaning least variance from each racket to racket).