What about providing MOTEC data Donat.
You are an advanced rF2 user so you could provide more detail.
The 70Nm seems indeed odd, as the Supra GT4 uses KW Racing coilovers (pretty sure that the are these:
https://www.kwsuspensions.net/racing/competition_5a/), not the street car's shocks, but those values could be a typo.
So my question is, does it behave as if the suspension is simply too soft, but in a consistent manner (ie. the issue is the values) or there is something that you can attribute to geometry?