The problem with the Borrego shocks is more the rebound valving than the overall stiffness--I think. You will notice that if you only go over one bump the response is not that bad, but if you go over a series of bumps the suspension doesn't seem to be able to rebound quick enough to handle the additional bumps. The overall handling, especially on smooth roads is great and, for me, the ride is fine except in those multiple bump situations. One of the main reasons I bought the Borrego was the handling--especially the "turn in".
I solved the problem on my much lowered Suburban with bilsteins (no more bottoming out and rides fine even with 6 adults).
Be very interested if anyone has tried to match a bilstein that might fit the Borrego.