unsprung weight is dealt with by the compression damping. You added weight with your axle, to shocks that were horribly bad at dealing with the 10-bolt..... Some better shocks would help. I'd say either 3rd gen Koni's (what we are putting on a magazine car this weekend with an S60) or Koni DA's. Note that I don't normally recommend DA's, but this is one case where they extra mass gives us a reason to have, and make some use of the compression adjustment.
__________________
www.stranoparts.com --814-849-3450 Results matter. Talk is cheap. We are miles beyond the success anyone else has had with the 4th gens, and C5, C6, C7 Corvettes,
10 SCCA Solo National Championships, 2008 Driver of they Year, 2012 Driver of Eminence
13 SCCA Pro Solo Nationals Championships
2023 UMI King of the Mountain Champion