Thanks carguy55!
A bit of an update. I got my new track wheels and tires mounted today. I went with MRR's M716, which are the ZL1 1LE replica's, but still flow-forged with JWL and VIA certifications. 19x10.5" et14 front and 19x11" et36 rear. All 4 corners got the Goodyear Supercar 3R tire in 305/30-19. FYI the front wheels are 26.5 pounds and the rears are 24.5 pounds. Pretty good for how huge they are.
2018 1LE updates by
Ryephile, on Flickr
2018 1LE updates by
Ryephile, on Flickr
To cope with the extra grip, I definitely need to address the dynamic camber loss problem as seen on the Supercar 3 front tire wear. After getting some good stabilizer bar rate info from member
jwisjw, I opted for the Hotchkis adjustable front bar and the BMR adjustable rear bar. This combo let's me use the soft/medium/hard options on both front and rear to make the stabilizer rates roughly 12%, 30%, and 50% stiffer than FE4 stabilizer bars. This will keep the neutral handling balance of the 1LE intact but with higher dynamic wheel rate and less body roll to compliment the grippier tire.
The final bit for now is with the help of
825moto, I picked up a set of take-off ZL1 brakes, front and rear calipers and rotors. They only have 2500 miles on them. The added 20mm of rotor diameter along with the swept area will be good for brake torque, but also the greater mass of the system will help mitigate the very high front caliper temps I was getting with the SS 1LE setup.
2018 1LE updates by
Ryephile, on Flickr
It's still very much brrr winter here in the Mitten, so it'll be a bit before it's all installed. I'm waiting on fresh new brake hoses to arrive from GM, always a smart idea when working on safety-critical stuff.