Jimmy,
I wonder if your foams are too hard for the car?
Alot of the RC18 drivers are using 30-35 shore maximum due to the light weight of the car.
It seems the harder foams work on the Blaze cos the Blaze is alot heavier.
Also I dont like the idea of using different compound foams F to R...being 4 wheel permenant drive surely you would suffer handlijg/grip issues by using different compounds?
Just a thought..hope it helps