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tl;dr -- Should I just buy a Corvette already?
But I'll say this... Change it up. Jump in a different car (yours or a codrive) for a season. It'll pop you out of any comfort zone and force you to not be lazy, plus hopefully you can confirm whether or not your particular car is playing into it much.
Also, and its rare I say this to ANYONE. But your motor and stuff is still basically stock right? You've done damn well with what you got. The suspension mods you did a year or two ago really brought your speed up. I wouldn't be afraid to take the car a little further into the class at this point.
Have you done EVO?
Drive a different car.
Change it up.
There is a pretty definite correlation between those drivers who have spend lots of time on both driving and car setup and the top of that list.
You have come along way with your driving and at the same point in my timeline, you're farther along than I was.
I'm an engineer so I like to break things down into principles that can be applied to situations