Do you have the rest of the setup?
Apart from the rear camber link length thats pretty much how I run the car indoors. Whats your shock setup, what antisquat are you running and how many washers do you have under the camber links?
On the WE I've found the front setup has very little to do with controling bodyroll, stiffening the rear seems to keep the whole car flatter. A good example of this is the setup I ran at the Teeside regional, very grippy carpet in places and I had silver springs on the front yet very little roll due to the rear camber link settings.
A quick thing you can try to see if you need more roll stiffness on the rear is to try the rollbar, remember though this will make the car a bit worse through small fast bumps.
I'll post my Teeside setup in the setups thread soon
