stiff rear suspension

[bdriven]

Hi folks,

I have a 2000 , X5, 4.4i. I now have 156,000 miles on it. Can't afford a new one, so I have replaced pretty much everything on this baby.

Recently, I feel that rear suspension is way too stiff, even for the sports version, I feel it so stiff, that it does not feel safe at higher speeds.

I do have a gt1 system at home, but I am not getting any error messages.
a while back I elevated the rear axle just a bit, but now, thinking that maybe that was the problem, lowered the rear axle level with the front. ( i do this via gt1).

Hopefully you guys can help me sort a few things out.
Could it be bad struts? when they go bad, they dont stiffen up, right?

THANKS!!!