Thanks Clive this has really helped a lot.
If I input my weight into the calculations this is what I get:
100lb/in front
CPM 85
170lb/in rear wheel rate (23.5mm)
CPM 95
~10% difference.
If I go higher rate in the front I'd have to go coilovers or even bigger TB otherwise the CPM's become very close.
Have a good weekend! Have a cold one for the germanlook forum (I may have several)
Mike