Which is "more" important: Front/rear bias or center of gravity?

[Rusty G]

If have 62# of ballast to play with need to know the best place to put it. The car is rwd.

I have 4 positions in mind.

#1 position places the weight 3" above the present center of gravity and makes 50F/50R weight distribution.

#4 position places the weight 6" below present the center of gravity but makes 51F/49R weight distribution.

Positions #2 ans #3 fall somewhere between these 2.

So what would your choice be, better front/rear weight bias or lowering center of gravity?