Depends where the rub is, the rear portion of the front wheel tub and wheelwell trim is pretty much vertical, you'll need a lot of vertical lift to defeat that if it is rubbing there. If you are rubbing top middle inboard above the shock, an inch or two can help a good bit. And if you are catchign the front of the front wheel opening, it's much like the back, near vertical.
The purpose of the aftermarket keys are only to give you more range of adjustment anyway. There's not inherent 'lift' in them, you are still limited by the stock control arm / bumper geometry. So it certainly doesn't hurt to first try turning your existing adjustment as far as you want / can, to see if it alleviates your rubbing. And either way, you're going to want ot have it re-aligned to correct the camber and prevent uneven wear on your tires.
At factory set, you ought to have ~8-12 turns before you get close to bottoming out the torsion key adjustment bolts. Each turn in ought to net you about ~1/4" of height. Spray some penetrating lube on the tip of the bolt where it nestles in the key, as well as the threads between bolt head and adjuster nut / crosspiece, before you start wrenching, it will go a lot easier. Not sure about your year range, but later is 18mm. It can be done with a breaker bar, vehicle sitting on the ground, as long as it isn't rusted up. It goes a lot easier with the vehicle jacked up and wheels hanging.