It's been speculated/proven(?) that the current MLB ball is juiced which is leading to increase offensive output on flyballs. With that said, as Laika pointed out, it's pretty much irrelevant to put any consideration of the ball into Biggio's increased offense since the rest of the league is also using the same ball, and that will be accounted for in a stat like wRC+ or any other that adjusts to the league average and competition.