I don't know if this helps, but I have found koni suspension teamed with poly-bushes, rear strut, front strut brace, (avoid the -45mm lowering springs or perish), with the rear track and front track checked on a proper engineering flat floor will make your RS Tub handle on rails. Also avoid having 17's as the lack of rubber can make the car bounce thus loosing traction, by products are torque steer and wheelspin, max you should go for is 16's!

Using this I have managed to build an RS Turbo that does not Torque steer, (Or at least I do not notice it), or loose traction!

I have had the car for 8 years and its been great.
Its also just come back from its holiday, (Restoration). Got some shocking pictures. Just interior to sort now