so if I'm following you right, you are saying that you have a very loose front end and a very stiff rear end? also, are you thinking that the loose front is transfering weight too quickly to a stiff rear, and being forced back to the front in a violent porpoise type action?
If so, then I would start with setting the rear shocks a little softer before changing the front shocks. as in make them looser on compression so that they "absorb and except" the weight being transfered from the front instead of "fighting and pushing" it back where it came from.