Mine is bone stock (just built it), so no ballast anywhere. I put my B4.2 on the scale to make sure the scale seemed right and it balanced almost exactly L/R (the battery and motor are on the center line in that buggy so not surprising). I moved the battery as far forward as it would go (in the 8ight) in the holder but it didn't make much difference (I only have about 1/2" of play, so not much adjustment available there).

I did not remove the shock springs when measuring, only the sway bars. Should I? I could see the springs shifting Front/Rear balance, but wouldn't think they'd skew things Left/Right?