Lowering the car to what I consider it's design height is really all we are talking about here. Look at EVERY gallery shot GM has for the C7 and show me where there is so much fender gap you can put your fist in. Go ahead and try, you won't find any. The car is set to the height it comes to us because they have to make sure it will be able to traverse the standard car loaders they use.
Anyway, run the car at whatever height you choose, it's your car, you should do with it as you please. Just do not come on here and suggest doom and gloom to those who choose to lower theirs. Whatever height you choose is within the factory adjustment range, you aren't going to have any suspension issues. Sure, if you are bottoming out at the delivered height then lowing it is out of the question but what's the worst than can happen if you lower it too much? Simple, you just raise it up. That's the beauty of this suspension (and coil overs if you've every had a car with those).
BTW, The adjustment is really there to allow you to corner weight the car, it's a really cool feature. I'm surprised none of the motoring press has expanded upon. If Grassroots were to review it you could be sure they would be all over it.
Sent from my iPad using Corvette Stingray Forum