RE: My 1/12 Jammin CRT.5 big block build
weight is a good thing in my opinion, it keeps the car on the ground and keeps it flat through terrain, also the aluminum chassis is much stiffer than plastic/fiber.
ive had my fair share of feather-lights, and they all handled poorly (except my F1) compaired to my "heavy" nitro cars. it takes a little while longer for the weight to shift on a heavy rig, but they are much more sure footed.