I've had a month or so running my suspension quite hard - a bit uncomfortable on really bumpy roads, but it helped with cornering feel. I also dropped the tyre pressur slightly (to 37psi) to filter out some of the nastier bumps.
However, on Sunday I softened the front suspension again, and went back to 39psi and the handling difference is noticeably better.
Turn in is much sharper and understeer is reduced.
I always remember being surprised to find that uprating the REAR antiroll bar gave better turn in - took me ages to work out why, but it would appear that reducing the damping at the front has had a similar effect.
I originally thought my tyres were wearing badly (only half worn) as the understeer was worse than I've ever had before. Five minutes adjustment has saved my spending £160 unneccesarily.