rear toe block most often affect the stability and rear traction of the car. i've only raced losi-s on carpet so thats where this is coming from. When i took toe out of the car it got physically faster in a straitline. and it freed up the car. but when i went too far the rear end wasent a stable and the car wanted to dive in and then set but i lost some corner speed due to the late setting of the rear end. my favorite setting so far is half degree toe blocks flipped to take 1 deg total out of the car. when i went to 2 deg. thats when it wasent as stable. when traction rises (big race) i may try 1deg blocks flipped to take 2 deg out, but normally it isint stable enough. when i left the stock blocks in the car, the rear end wasent fast enough for me and it wasent pushing but it wasent free either. sorry for the long explaination but thats my trial. any other expierences?