extra weight on the back by the transmission will help the car rotate around the corners faster ..


put a couple oz's of ballast on the nose & test for your self

Adding weight on the nose does make for less steering , but will add a little on power steering & help prevent the nose from coming up or wheelie...


conclusion

more weight on the nose steers less where you need steering , and steers more where you need less steering ...
Hope that makes sense ...