[Ohio Ken]

On the QA1 coilover that in am looking at, seems to call for much less spring rate: these rates are directly from their chart based on front and rear axle weight.
1750 ft-1900r= 350# spring rate
1525fr-1659r= 275#
1325ft-1450r= 185#
1150ft-1250r= 125#
I don't know what my front and rear weigh but I think it would be closer to one of the last 2. But then look at the spring rate 185#? Seems light.
I wonder if coil overs use different spring rates than just straight up coil springs?
At $400.00 for a set, I want to get it right the 1st time. Now even more confused?
Ken