Looking at those photos it appears you need more spring in the rear for sure...it would help get the inside front down and helping with the corner grip.
Based on the Autocross and Road Race section of the Corvette Forum most are running spring rates in the rear very close to what is in the front on a 50/50 weight bias. Would thing at a minimum you would be at about 350 in the rear. With slicks, 700 f and 500 rear would not be out of the question.
What is the length, diameter and arm lengths of your front bar?
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