XRAY - Model racing cars

hello i had build my x12, 15 and without electronics my center ride height is 3 mm when in front is 4,8 and 5 in rear, this is due to the diameter of the tires, my questios is the side spring are used for??? lateral balance?? i have to raise the preload of the spring??

the spring of the center shock i was trying to say..

If your center ride height is much lower than front, and rear pod, then you need more preload in the center spring! Adjust the rear pod droop accordingly

thanks alex, i will setup when my electronics arrive..