Adjusting the dampers only affect the softness or hardness of the actual ride. To be able to adjust the ride height you need to have coil over damper suspension units with adjustable spring platforms. Myself and other New Zealand Plus 6 owners have purchased such units from SSL for our cars.
While the ground to outer wheel arch measurement is an easy way to check your suspension height, what you should do is to measure the ground to chassis height at each of the jacking points. The are the flat surface with a hole in them and adjacent to the attachment point of the lower wishbone suspension arm. You should have front left and right 135mm and rear 155mm plus or minus 5%.
What have you got?
Kerry
