Impossible in the wet!

[johnpage]

My Ralt RT32 is impossible in the wet!
Driven very quietly it simply spins it's rear wheels and spins.
The dampers are in good condition but probably valved "as original".
The car would have had hard springs when new but I am running 350 rears and 250 fronts
Corner weights are about 85kg each for the fronts and 150kg each for the rears
Handling in the dry is reasonable.
The suspension moves up and down ok when springs etc are removed and so there is no geometric lock.
The car moves very little when I jump on the front and is solid awhen I jump on the back.
Any thoughts to help greatly appreciated!