Platinum_Injected

hey all,
just curious on what spring rate i should run to get my rear level to my front... and i'm not really familiar with spring rates and whatnot... i will include the details of my coilover kit and include a picture of my car... i'd like to have my rear slightly tucking like my front is... and curious which details of rear spring to purchase to set me up as close to the front as possible... thanks in advance

spring specs from coilovers:
Spring Rates:
Front : 8KG / 150mm
Rear : 9KG / 150mm