I put 5 turns(torsion bars) on my '02 Z71, put on 285 A/T KOs a short time later, and have not rubbed ONCE, even on turn/bump combos or medium off-roading. I told the alignment guy to make sure he adjusted the camber, but I'm thinking he didn't so I'm gonna get it done again. My truck's not perfectly level, but the tires fit and I don't have to worry about too much stress on my IFS front end(which are notorious for problems anyway

). Also, I frequently tow moderately heavy loads, and I'd rather the truck sit level then instead of the rear down.
The problem with the keys is that they allow you to crank the bars further than the factory keys because they are indexed. This doesn't change the fact that severe angles are still hard on the CV joints or that you have to adjust the camber or change the bump stops. So, if you subscribe to the idea that cranking the bars a bunch is hard on the front end then the new keys don't fix your problem.
Jeb