I've got a yonex v-con 17 which weighs around 292 grams stock. I've added around 9 grams of weight at 3 and 9 o'clock each because the racket feels is too whippy. In stock the v-con is 2 pts head-heavy. I don't want to make it more head heavy than 6 pnts head heavy. The swingweight is in stock 315. How much swingweight does it have with the added weight.