I had the opposite problem: my springs were too short at full adjustment to get the car up high enough. On the Bilsteins which I originally had, the shock body had a longer range of adjustment, but the Ridetechs have a shorter range (less threads on the body).
I spoke with Ron Sutton about it, and he actually recommended that I use a coil spring spacer instead of using a longer spring. I don't remember the exact details, but he suggested that a shorter spring is actually more responsive than a longer spring of the same diameter and rate.
So instead of going with a 10" spring to get the height back up, I stuck with my 8" spring and added a 2" aluminum body spacer.
I know that doesn't directly answer your question, but perhaps a shorter spring, maybe 10" to 8", with a 1" spacer would get you into a better position?
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