I'm 5% on the brow, 5% on the back and back window, and 35% on the fronts. That works great for me.
I think the darkest I went on the fronts was on my Jaguar (went with 20%) and during the daytime it's nice, but at nighttime it became problematic because you couldn't see left or right on a normal street road. At night one time a bicyclist ran the stop sign and I didn't see them and started to go. Thankfully I saw him at the last moment and slammed on my brakes. Almost hit him. Tint came off the next day. And I'm a safe driver too.
I knew on my next car (2005 Cobalt SS Supercharged Stage 2) that I wouldn't go that dark so I started going with 35% on the fronts (which is still illegal in California).
But even comparing photos, the amount of visible light from the angles of the car make the Camaro interior darker than the Cobalt, even though the tint was the same.
So in short, it's not always safe to go with what looks cool, but go with something you're comfy in that won't make you paranoid every time a cop looks your way. You're already in a Camaro, don't give yourself anymore reasons to be pulled over, especially for tint darker than it needs to be/legally can be.