Oh..you don't have the GC coilover kit either do you? Probably not the best idea to go with the exact same springs as ryeboy in that case. He did mention his setup seemed harsh until after about 500 miles though. Also, I know it's been mentioned but I think it's strange that GC recommends higher rates in the front when the OE setup seems to have higher rates in the rear. But that being said, it's also strange to me that the OEM has higher rates in the rear because OEM setups usually tend towards understeer and higher rates in the rear would reduce understeer. Maybe GC is giving you guys rates that work more closely to most OEM handling characteristics though?
I wish it was easier to get confirmed numbers on this kinda thing for this car.
If the numbers are correct for the oem spring rates, I'd want to keep that balance or go even stiffer for the rear springs but there are probably things I don't understand at play too.