I have no idea who makes OME shocks, but the fact they have several different part numbers based on spring rate, shows they valve them differently.OME shocks are just re-branded Monroe shocks. I believe that both Biltstein and OME shocks are valved predominantly with high-way driving in mind. It is not very often that folks will intentionally drive +35mph over corrugated terrain.
@SONICMASD has what most people have considered to be the "perfect" combo.
I believe a great middle of the road shock that will perform a lot better than the Bilsteins in this scenario would be KONI RAID90s.
You can't slap on a shock made for a stock spring rate with a much heavier spring and expect it to work, simple physics.
If you had kings set up for stock springs and ran them with heavier springs they would behave the exact same.