I put 2 sets of King springs in that car and both sets sagged By comparison the 355 hasn't moved at all
I'd hate to think, springs rates you go stiffer should be in degrees of 50 pounds each time you increase the stiffness...its the cheapest way to improve a cars handling imo.
pounds ib? too soft way to soft .I bet your 355ch is around 800 to 1,000 front? rear a guess 500 to 600?
The sweet spot was always 400, but I cut it back 50 because it's a GTS and I didn't want to exaggerate the chassis twist.