Thanks Dave for your response.

Now I have 3 post load cases after hanger design as below:
1. OPE (W+T1+P1+H+U1+CS)
2. OPE (W+P1+H+U1+CS)
3. Sus (W+P1+H+U1)

Now there is a huge difference in vertical displacement because of CS in all the above 3 cases.
My query is what is the perfect way to design the Spring for load & travel in this case?