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What exactly are your expectations of the car?
If it's faster lap times, then that can be down to the driver. They are quick cars in the right hands.
Your current setup should be pretty quick tbh, although 400lb springs are only 7kg. A step up to 550lb/100nm springs would be equivalent to...
I take it you've fitted the insert properly.
I've seen it where people have fitted them and not put that metal bracket with the black rubber tabs back in ?
This thing on the right