Lead experts,
I need some help from you.
I own a BA98 (stock specs: 315g - 9 pts HL - 290 SW) that I purchased from TW Europe. (I asked several times before but I still don't understand the different specs (315g - 4pts HL- 331 SW) mentioned on TW USA).

Pro Kennex Black Ace 98 - 352 grams - 7 pts HL - Head RIP Control 17g 60/57 lbs (27/26 kg) -
2 layers of 6" x 1/4" lead strips at 3 and 9 - Babolat Leather Grip - Dunlop Hydratac Overgrip
It plays better than in stock this way but I still want more solidness and a higher SW.
Should I add about 5 grams ( 1/4" of 10" long strips at 12) and counterbalance at 7" from buttcap?
Any advice would be appreciated.