Tristan, Torsen's need a load being applied to both sides of the diff to work, if they have no load through one side, they just go into an open state until load comes back on them.
Jez, I also spoke to a couple of mates who run Silvia's like your's, and they all think that your main issue is that the spring rates are way to high for the weight of the car. They believe that you should be looking at max rates of 6Kg/mm front and 4Kg/mm rears.
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