Superb articles, strange thing is Richard Asquith is an old friend of mine and I did work for him for a while , doing a lot of prep work on the CRX championship cars. Small world so must have come across your car ! Never tried rising rate springs rather complex to sort out and very difficult to measure, so would not be easy to replicate your suspension. It definately has advantages you can run quite soft on initial compression which gives excellent traction out of corners, thats why yours is so good.
Thanks Barry.