I don't know much about aftermarket flywheels for this specific car. I didn't research it yet, but I don't see how it would affect the tuning...
What kind of tires are you running? 285 is pretty wide! Try lowering the tire pressure to 30PSI, or even 28PSI. Also, an aggressive rear alignment will decrease traction in the back, I'm at -2.5* and I will soon change to stock or even -1* camber in the back
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