I have some friends running Bilsteins on vehicles other than Suzukis. They do run stiffer than I'd like to have on a vehicle. You might want to cinsider tilting your shock mounts over (front and rear) to soften them up a bit.
In my opinion the Bilstien's are probably a better quality shock than the Rancho's.
By changing the mounting points and tilting the shock to the side that should give you some more travel out of the shock.