I think the KWs will wipe the track with the Dinan St III in terms of performance. The problem is the Dinan reuses the OEM dampers so that is the limiting performance factor.
I have a Dinan Stage 3+...Dinan stage 2 + GC camber plates. It does improve upon the understeer but its not much of a difference in terms of improving its performance potential.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red