Is it safe to assume that you measured or found the OEM spring rates? How do they compare to what's written on the KW or MPP springs?
And why don't you list your spring rates? If I was going to make a set of coilovers to compete with you the first thing I'd do is buy yours and take a bunch of measurements, not just of the spring rates but everything else too - just like you did with the OEM parts. So by hiding your rates you're not really making it harder for competitors, you only make it more difficult for customers to choose the product that best suits them.