Calvert rear suspension help required

[toyotaxr8]

Hello i recently purchased calvert one inch lower split mono leaf springs and their 9 way adjustable rear shocks part number CR44116. The issue I'm having its that with the car on the ground i have only 1 inch of travel on the shocks before they bottom out but there is 2.5 inch before the diff hits the bump stops. Has anyone else found this issue before? And how did you fix it?

Any help greatly appreciated Cheers Greg