Im no expert either, and I agree with beavenx

A lighter car is easier to control, when the weight is down enough I add a little more up front (bumber) to help fine tune my control.
I like to drive with 2 different styles, I use a 27t on slick surfaces with abs or harder tires and a Brushless with HPI super-Ds or Yok HG type d on black top or rougher surfaces.

the slower car gets into the tight turns better, and it just perfect for the street in my neighborhood, I like the brushless for wide open parkinglots for big drifts.

Also Im prolly going about this all wrong, but the more power I add the more I stiffen the shocks in the rear.

hope that helps a little, and if your in Phoenix you should come out and drift with us sometime, I can show you a few cars with the different types of setups and oh ya...we carry drift parts in hand local in phoenix too.