are you guys talking about being right at the legal weight or being under weight? I've found my car handles great at the legal weight and havn't had to add any extra weights to get the car to handle well, however when the car is under weight it handles awful. I think the key is adding the weight at the right places to make the car balanced and you shouldn't need to add weight above the legal min.
B4 with 3200 packs and orion 7.5 motor