Search and yee shall find:
http://www.theminifo...rigs/?p=2571820
by your spring rates your running a car engined conversion?
Are you running with Anti Roll Bars?
Are you able to describe what it is that you're feeling that prompts you to say you feel the front is too stiff? I have found that the front feels a bit too soft in the past, as have others, especially when lifting off from hard acceleration at high speeds.