Spring rate Question

[LS1-IROC]

Thanks for the info. My koni's are only rebound adjustable. Sounds like I either need a better shock in the rear or a heavier spring. I'm leaning towards a heavier spring right now (due to cost). I'm hoping maybe a 200lbs spring will help without making the ride too harsh. This is a 99% street car so comfort is key. Are you running 300lbs springs in a 3rd gen? That seems really high?