I'm sure there's more time to be had pushing harder in the corners if your tires look like that (a bit more inner wear than outer) with that little camber. Are the rears worn more evenly?
My instructor at VIR had me try something that seemed odd at first... Coast into corners (brake early and let off the brakes early) and worry about getting the apex and exit right. When you're not unsettling the car with brakes you can figure out exactly what the limit is mid-corner. I did that for a few laps, building speed until the car was getting a touch out of shape and I was using every inch of track. Then my instructor told me that was my limit for today and to back it off a touch, but carry more speed in and try to approach the same limits when adding brakes. Not only was I much faster there, but I ended up being more comfortable so I wasn't getting stiff mid corner and trying to force the car around with jerky movements. aka I was scaring myself silly and tensing up making the car feel more on the limit than I was... This is a fantastic thing to practice when you don't get a point by, you end up giving them a bit more room and you carry a ton of exit speed to possibly line yourself up for a pass that otherwise may not have been possible.
If you're curious what I mean, you can see me lifting and coasting down the "Roller Coaster" (after the back straight) in my VIR Full video.
Once I figured out that I was nowhere near the limits I was literally just hitting the kerbing and sliding the car around like an idiot and giggling my head off. Tons of fun, but reeling it in a little was faster
I think you'd benefit from having an instructor willing to help you push yourself really hard, but that will be tough to find when they see a car on slicks with all of that aero and power. I'd be nervous getting in a car like yours without some serious safety equipment... Street tires can't produce anywhere near the same grip so it's a lot slower and the tread blocks allow some forgiveness at the limit too with a pretty gentle breakaway.