The calculations I did were purely to see if they were within the ball park of what people have been suggesting, not for myself, or atleast not for a while. And from my rough calcs and some assumptions it seems "theoretically" the spring stiffnesss are fairly accurate. They assumed modelling a vehicle as a whole and with a 50:50 weight distribution which the golf clearly doesn't have, so no I wouldn't put the same poundage springs on all four corners. If I had a day spare to accurately measure a mk2's chassis and do the calcs I could probably tell you "theoretically" the perfect spring rates for a desired application. Even then as Im sure you know "perfect" is never achieved without a whole lot of real life testing and will only apply to one particular circuit on one particular day.